{"id":29969,"date":"2026-09-16T17:42:46","date_gmt":"2026-09-16T12:12:46","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=29969"},"modified":"2026-09-16T17:42:46","modified_gmt":"2026-09-16T12:12:46","slug":"carbon-sequestration","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/carbon-sequestration\/","title":{"rendered":"Carbon Sequestration, Types, Importance, Methods, Technologies"},"content":{"rendered":"<p><span style=\"font-weight: 400\">Carbon sequestration is the capture and long-term storage of carbon, particularly CO\u2082, in biological, geological, oceanic or engineered reservoirs, thereby limiting its accumulation in the atmosphere. It plays an important role in climate-change mitigation by reducing the amount of CO\u2082 contributing to atmospheric warming. Carbon can be stored biologically in forests, soils and wetlands, absorbed by oceans, or captured and stored in underground geological formations through technological methods. Practices such as afforestation, reforestation, sustainable agriculture, soil management and carbon capture technologies can enhance sequestration.<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">However, the effectiveness of carbon sequestration depends on storage permanence, ecosystem health, technological costs, land availability and reliable monitoring. Carbon sequestration complements emission reduction by protecting and strengthening carbon sinks while helping address residual emissions from difficult-to-decarbonise sectors.<\/span><\/p>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Meaning<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration means the process of capturing carbon dioxide from the atmosphere and storing it in stable reservoirs such as vegetation, soils, oceans, rocks or engineered storage systems, thereby limiting atmospheric warming.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Carbon exists naturally in different forms and moves continuously between the atmosphere, vegetation, soils, oceans and geological systems.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">However, the accumulation of additional CO\u2082 from activities such as fossil-fuel combustion and land-use change strengthens the greenhouse effect.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Carbon sequestration seeks to capture and retain some of this carbon for longer periods.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Types<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration can occur through natural biological processes as well as oceanic, geological and technological pathways, depending on where carbon is captured and how it is stored.<\/span><\/p>\r\n<h3><span style=\"font-weight: 400\">Biological Carbon Sequestration<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">Biological sequestration occurs when plants, soils and ecosystems absorb CO\u2082 and retain the resulting carbon in living or organic matter. Photosynthesis converts atmospheric CO\u2082 into organic compounds that become part of plant biomass and soil carbon. Major biological carbon-storage systems include<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Forests<\/b><span style=\"font-weight: 400\">: Trees store carbon in trunks, branches, roots, leaves and surrounding soils.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Grasslands<\/b><span style=\"font-weight: 400\">: A substantial share of their carbon is stored below ground in roots and soils.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Wetlands and peatlands<\/b><span style=\"font-weight: 400\">: Waterlogged conditions can allow large quantities of carbon to remain stored for long periods.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Agricultural soils<\/b><span style=\"font-weight: 400\">: Better soil-management practices can increase soil organic carbon.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Ocean Carbon Sequestration<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">Ocean sequestration involves storing carbon in marine systems. Oceans naturally absorb roughly one-quarter of human-generated CO\u2082 emissions annually, although this uptake also contributes to ocean acidification. Some proposed enhancement approaches include<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Ocean fertilisation:<\/b><span style=\"font-weight: 400\"> Adding nutrients such as iron can stimulate phytoplankton growth, increasing biological CO\u2082 uptake.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Direct ocean injection<\/b><span style=\"font-weight: 400\">: Captured CO\u2082 can be introduced into deeper ocean waters, where pressure and temperature conditions may support longer-term storage.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Geological Carbon Sequestration<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">Geological sequestration stores captured CO\u2082 in suitable underground formations. Carbon dioxide from industrial facilities or energy-related sources can be captured, compressed and injected into porous geological formations for long-term storage.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Potential storage formations include deep reservoirs and suitable porous rock structures capable of retaining CO\u2082 for very long periods.<\/span><\/li>\r\n<\/ul>\r\n<h3><span style=\"font-weight: 400\">Technological Carbon Sequestration<\/span><\/h3>\r\n<p><span style=\"font-weight: 400\">Technological sequestration uses engineered systems to capture and store CO\u2082. Examples include Carbon Capture and Storage (CCS), Direct Air Capture (DAC) with permanent storage (DACCS) and emerging technologies that use captured carbon as an industrial feedstock.<\/span><\/p>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration and Types of Carbon<\/span><\/h2>\r\n<p><img decoding=\"async\" class=\"wp-image-29971 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104235\/Types-of-Carbon.png\" alt=\"Carbon Sequestration\" width=\"814\" height=\"443\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104235\/Types-of-Carbon.png 845w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104235\/Types-of-Carbon-768x418.png 768w\" sizes=\"(max-width: 814px) 100vw, 814px\" \/><\/p>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Working<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration works by transferring CO\u2082 from the atmosphere or concentrated emission sources into reservoirs where it can remain stored for extended periods, reducing its contribution to atmospheric warming.<\/span><\/p>\r\n<p><img decoding=\"async\" class=\"wp-image-29972 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104844\/Carbon-Sequestration-Working.png\" alt=\"Carbon Sequestration\" width=\"797\" height=\"341\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104844\/Carbon-Sequestration-Working.png 1918w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104844\/Carbon-Sequestration-Working-768x328.png 768w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16104844\/Carbon-Sequestration-Working-1536x657.png 1536w\" sizes=\"(max-width: 797px) 100vw, 797px\" \/><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Natural Process<\/b><span style=\"font-weight: 400\">: Plants absorb CO\u2082 through photosynthesis and convert it into organic carbon. Some of this carbon remains in vegetation, while some enters soils through roots, plant residues and decomposition.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Agricultural Process<\/b><span style=\"font-weight: 400\">: Farmers can increase soil carbon through practices such as:<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Reduced or no tillage<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Cover cropping<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Maintaining crop residues<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Diversified crop rotations<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Improving soil organic matter<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Agroforestry<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Restoring degraded land<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Protecting peatlands<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Reducing soil disturbance can also help prevent previously stored carbon from being released back into the atmosphere.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Forest-Based Process<\/b><span style=\"font-weight: 400\">: Forests capture CO\u2082 through photosynthesis and store carbon in biomass, deadwood, litter and soils. However, harvesting, fires, deforestation and other disturbances can release stored carbon.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Therefore, maintaining healthy and sustainably managed forests is important for preserving their role as carbon sinks.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Geological Process<\/b><span style=\"font-weight: 400\">: In geological storage, CO\u2082 is captured, compressed and transported to appropriate underground sites before being injected into porous rock formations. This provides a pathway for long-term carbon storage.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Methods<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Different methods target different carbon reservoirs, ranging from ecosystem restoration to advanced technological capture systems.<\/span><\/p>\r\n<table style=\"width: 92.284%\">\r\n<tbody>\r\n<tr>\r\n<td class=\"tb-color\" style=\"width: 18.1363%\"><b>Method<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 47.996%\"><b>How it works<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 25.2505%\"><b>Major storage location<\/b><\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Afforestation<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Establishes additional tree cover to absorb CO\u2082<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Biomass and soil<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Reforestation<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Restores forests on previously degraded or cleared land<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Biomass and soil<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Soil carbon management<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Improves practices that increase soil organic carbon<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Agricultural soils<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Wetland and peatland restoration<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Protects ecosystems capable of retaining large carbon stocks<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Wetlands and peat soils<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Ocean sequestration<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Enhances or utilises marine carbon uptake.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Oceans<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Geological storage<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Injects captured CO\u2082 into suitable underground formations<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Rocks and geological reservoirs<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Carbon Capture and Storage<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Captures CO\u2082 from major emission sources and stores it underground<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Geological formations<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Direct Air Capture<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Uses chemical or physical processes to extract CO\u2082 directly from the ambient air, which can then be permanently stored or utilised. The captured CO\u2082 can serve as a sustainable, recycled raw material or feedstock, such as in plastic production.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Geological or other storage<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 18.1363%\">\r\n<p><span style=\"font-weight: 400\">Bioenergy with Carbon Capture and Storage<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 47.996%\">\r\n<p><span style=\"font-weight: 400\">Combines biomass-based energy with capture and geological storage<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 25.2505%\">\r\n<p><span style=\"font-weight: 400\">Geological formations<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<p><img decoding=\"async\" class=\"wp-image-29974 aligncenter\" src=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16105019\/Carbon-Sequestration-CCS-vs-DAC.png\" alt=\"Carbon Sequestration\" width=\"848\" height=\"400\" srcset=\"https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16105019\/Carbon-Sequestration-CCS-vs-DAC.png 1825w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16105019\/Carbon-Sequestration-CCS-vs-DAC-768x363.png 768w, https:\/\/vajiramias.sgp1.cdn.digitaloceanspaces.com\/wp\/upsc-exam\/2026\/09\/16105019\/Carbon-Sequestration-CCS-vs-DAC-1536x725.png 1536w\" sizes=\"(max-width: 848px) 100vw, 848px\" \/><\/p>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Importance<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration is important because it complements emission reduction by removing or storing CO\u2082 and strengthening the capacity of natural and technological systems to retain carbon over time.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Mitigates Climate Change:<\/b><span style=\"font-weight: 400\"> Storing CO\u2082 reduces the amount of carbon available to contribute to the greenhouse effect and can therefore support efforts to limit global warming.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Supports Net-Zero Goals<\/b><span style=\"font-weight: 400\">: Some sectors, particularly difficult-to-decarbonise industries, may continue producing residual emissions. Carbon sequestration can help address part of these residual emissions alongside deep emission reductions.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Protects Natural Carbon Reservoirs: <\/b><span style=\"font-weight: 400\">Forests, grasslands, <a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/wetlands\/\" target=\"_blank\"><strong>wetlands<\/strong><\/a>, peatlands, soils and oceans can retain substantial quantities of carbon. Protecting these systems helps preserve their climate-regulating functions.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Improves Soil Health<\/b><span style=\"font-weight: 400\">: Carbon-rich soils can support biological activity, soil structure and moisture retention. Agricultural practices that enhance soil carbon can therefore provide both climate and land-management benefits.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Supports Biodiversity<\/b><span style=\"font-weight: 400\">: Protecting and restoring forests, wetlands, grasslands and peatlands can simultaneously support carbon storage and ecological conservation.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Supports Sustainable Resource Use:<\/b><span style=\"font-weight: 400\"> Wood products from sustainably managed forests can continue storing carbon during their useful life, while sustainably sourced wood can also substitute for some carbon-intensive materials and fossil fuels<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration vs Carbon Removal vs Carbon Sink<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">These terms are closely connected but describe different aspects of the carbon cycle and climate mitigation process.<\/span><\/p>\r\n<table style=\"width: 90.1802%\">\r\n<tbody>\r\n<tr>\r\n<td class=\"tb-color\" style=\"width: 13.5966%\"><b>Term<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 48.883%\"><b>Meaning<\/b><\/td>\r\n<td class=\"tb-color\" style=\"width: 26.8992%\"><b>Examples<\/b><\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 13.5966%\">\r\n<p><span style=\"font-weight: 400\">Carbon sequestration<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 48.883%\">\r\n<p><span style=\"font-weight: 400\">Capturing CO\u2082 and storing it in a reservoir for a period of time<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 26.8992%\">\r\n<p><span style=\"font-weight: 400\">Forests storing carbon in biomass and soil<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 13.5966%\">\r\n<p><span style=\"font-weight: 400\">Carbon removal<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 48.883%\">\r\n<p><span style=\"font-weight: 400\">Taking CO\u2082 that is already present in the atmosphere and removing it through a process<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 26.8992%\">\r\n<p><span style=\"font-weight: 400\">Direct Air Capture, Afforestation<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 13.5966%\">\r\n<p><span style=\"font-weight: 400\">Carbon sink<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 48.883%\">\r\n<p><span style=\"font-weight: 400\">A natural or other reservoir that absorbs and stores more carbon than it releases over a given period.<\/span><\/p>\r\n<\/td>\r\n<td style=\"width: 26.8992%\">\r\n<p><span style=\"font-weight: 400\">Forests, oceans and wetlands<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Challenges<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration offers significant climate benefits, but its effectiveness depends on permanence, environmental conditions, technology, cost and proper monitoring.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Risk of Carbon Release<\/b><span style=\"font-weight: 400\">: Stored carbon is not necessarily permanent. Forest fires, deforestation, soil disturbance and ecosystem degradation can release previously stored carbon back into the atmosphere.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Climate Change Can Weaken Natural Sinks<\/b><span style=\"font-weight: 400\">: Changes in temperature and rainfall can affect forest health and productivity. Droughts, fires, storms and pests can reduce the ability of forests to continue functioning as carbon sinks.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>High Cost of Some Technologies<\/b><span style=\"font-weight: 400\">: Technological approaches such as direct air capture require substantial energy and remain expensive, limiting their widespread deployment.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Ocean Acidification:<\/b><span style=\"font-weight: 400\"> Although oceans absorb substantial quantities of CO\u2082, increased carbon uptake contributes to ocean acidification, creating risks for marine ecosystems and organisms that form shells.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Land Availability:<\/b><span style=\"font-weight: 400\"> Large-scale afforestation and ecosystem restoration can compete with agriculture, settlements and other land uses if poorly planned.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Measurement and Verification<\/b><span style=\"font-weight: 400\">: It can be difficult to accurately determine how much additional carbon has been stored, for how long it will remain stored and whether the storage is genuinely additional.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Technological Limitations<\/b><span style=\"font-weight: 400\">: Engineered solutions such as direct air capture and geological storage require <\/span><strong><a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/infrastructure\/\" target=\"_blank\">infrastructure<\/a><\/strong><span style=\"font-weight: 400\">, energy, transportation networks, suitable storage locations and long-term monitoring.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Risk of Relying on Sequestration Instead of Emission Cuts<\/b><span style=\"font-weight: 400\">: Carbon sequestration should complement, rather than replace, rapid reductions in fossil-fuel use and other greenhouse gas emissions.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Sites in India<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Examples of carbon sequestration sites in India include geological formations and natural ecosystems capable of storing carbon dioxide, ranging from deep saline formations and basaltic rocks to oil fields, coal-bearing regions and forests.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Krishna-Godavari Basin<\/b><span style=\"font-weight: 400\">: The Krishna-Godavari Basin is considered one of India's promising regions for geological CO\u2082 storage. Its geological characteristics make it a potential area for further investigation, including source-sink mapping, geological assessment and development of suitable CCUS projects.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Mumbai Offshore Basin<\/b><span style=\"font-weight: 400\">: The Mumbai Offshore Basin represents another potential region for geological CO\u2082 storage. Its offshore formations could support carbon storage, subject to detailed studies of geological characteristics, storage capacity, source-sink linkages and technical feasibility.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Cambay Basin, Gujarat:<\/b><span style=\"font-weight: 400\"> The Cambay Basin in Gujarat is another prospective region for geological carbon storage. The presence of existing oil and gas infrastructure in Gujarat could also provide supporting infrastructure for the development of future CCUS projects.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The Gandhar field in Gujarat is an important example associated with CO\u2082-based Enhanced Oil Recovery (CO\u2082-EOR), involving ONGC and Indian Oil Corporation.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Deccan Basalt<\/b><span style=\"font-weight: 400\">: The Deccan Basalt formation across western and central India offers significant potential for long-term geological CO\u2082 storage. Carbon dioxide can potentially be stored through mineralisation, in which CO\u2082 reacts with minerals in basaltic rocks and is converted into relatively stable carbonate minerals.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Rajmahal Basalt:<\/b><span style=\"font-weight: 400\"> The Rajmahal Trap in Jharkhand is another basaltic formation with potential for geological CO\u2082 storage. Along with the Deccan basalt system, it represents an area requiring further geological investigation to determine its practical storage potential.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Deep Saline Formations:<\/b><span style=\"font-weight: 400\"> Deep saline formations are among India's important potential resources for geological carbon storage. These are deep underground porous rock formations containing saline water, into which CO\u2082 can potentially be injected and retained through different geological trapping mechanisms.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Coal-Bearing Regions:<\/b><span style=\"font-weight: 400\"> Unmineable coal seams can potentially be used for CO\u2082 storage while simultaneously supporting Enhanced Coal Bed Methane Recovery (ECBMR). Potential coal-bearing regions include Raniganj, Jharia, Bokaro, North Karanpura, and Sohagpur.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><b>Forests and Native Tree Landscapes:<\/b><span style=\"font-weight: 400\"> Forests and native tree landscapes are important biological carbon sequestration systems because trees absorb atmospheric CO\u2082 through photosynthesis and store carbon in biomass and soils.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration Technologies<\/span><\/h2>\r\n<p><span style=\"font-weight: 400\">Carbon sequestration technologies involve different methods of capturing carbon dioxide and storing it in stable forms or locations so that it does not return to the atmosphere. Technological approaches range from geological storage to mineralisation and enhanced natural processes that can accelerate long-term carbon removal.<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><b>Enhanced Mineral Weathering: <\/b><span style=\"font-weight: 400\">Enhanced mineral weathering accelerates the natural process through which rocks react with carbon dioxide and water.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">In this process, minerals are exposed to CO\u2082 to increase the rate at which carbon dioxide is converted into stable forms, particularly carbonate minerals.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">This can provide a pathway for long-term carbon storage.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>CO\u2082 Mineralisation<\/b><span style=\"font-weight: 400\">: CO\u2082 mineralisation converts carbon dioxide into stable solid carbonate minerals through chemical reactions with suitable rocks or minerals. Materials such as basalt, olivine, serpentine and suitable industrial alkaline wastes can participate in these reactions.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Since the carbon becomes incorporated into relatively stable mineral forms, mineralisation offers a potential route for durable carbon storage.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Ocean-Based Carbon Removal:<\/b><span style=\"font-weight: 400\"> Ocean-based approaches seek to increase the capacity of seawater to absorb and retain atmospheric carbon dioxide.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Mineral-based techniques can enhance alkalinity and promote chemical reactions that facilitate carbon storage.<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">However, their large-scale application requires careful assessment of ecological impacts, monitoring requirements and technical feasibility.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Carbon Capture and Mineral Storage<\/b><span style=\"font-weight: 400\">: Carbon capture can be combined with mineralisation to store CO\u2082 permanently.<\/span>\r\n<ul>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Carbon dioxide captured from industrial facilities can be processed and reacted with suitable minerals, transforming it into stable carbonate compounds.\u00a0<\/span><\/li>\r\n\t<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">This approach can reduce the risk of CO\u2082 leakage associated with some conventional storage methods.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li style=\"font-weight: 400\"><b>Biochar: <\/b><span style=\"font-weight: 400\">Biomass is heated under limited oxygen through pyrolysis, producing a carbon-rich material that can be incorporated into soils, potentially increasing the persistence of carbon while improving some soil properties.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400\">Carbon Sequestration UPSC PYQs<\/span><\/h2>\r\n<p><b>Q1.<\/b><span style=\"font-weight: 400\"> What is Carbon Capture, Utilization and Storage (CCUS)? What is the potential role of CCUS in tackling climate change?<\/span> <b>(UPSC Mains 2025)<\/b> <span style=\"font-weight: 400\">\u00a0<\/span><\/p>\r\n<p><b>Q2.<\/b><span style=\"font-weight: 400\"> With reference to Direct Air Capture, an emerging technology, which of the following statements is\/are correct? <\/span><b>(UPSC Prelims 2025)<\/b><\/p>\r\n<p><span style=\"font-weight: 400\">I. <\/span>It can be used as a way of carbon sequestration.<\/p>\r\n<p><span style=\"font-weight: 400\">II. <\/span>It can be a valuable approach for plastic production and in food processing.<\/p>\r\n<p><span style=\"font-weight: 400\">III. In aviation, it can be a source of carbon for combining with hydrogen to create synthetic low-carbon fuel.<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">Select the correct answer using the code given below.<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">a) I and II only<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">b) III only<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">c) I, II and III<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">d) None of the above statements is correct<\/span><\/p>\r\n<p><b>Ans: (c)<\/b><\/p>\r\n<p><b>Q3.<\/b><span style=\"font-weight: 400\"> What is blue carbon? <\/span><b>(UPSC Prelims 2021)<\/b><\/p>\r\n<p><span style=\"font-weight: 400\">a) Carbon captured by oceans and coastal ecosystems<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">b) Carbon sequestered in forest biomass and agricultural soils<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">c) Carbon contained in petroleum and natural gas<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">d) Carbon present in atmosphere<\/span><\/p>\r\n<p><b>Ans: (a)<\/b><\/p>\r\n<p><b>Q4.<\/b><span style=\"font-weight: 400\"> In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be the potential sites for carbon sequestration? <\/span><b>(UPSC Prelims 2017)<\/b><\/p>\r\n<ol>\r\n\t<li><span style=\"font-weight: 400\"> Abandoned and uneconomic coal seams<\/span><\/li>\r\n\t<li><span style=\"font-weight: 400\"> Depleted oil and gas reservoirs<\/span><\/li>\r\n\t<li><span style=\"font-weight: 400\"> Subterranean deep saline formations<\/span><\/li>\r\n<\/ol>\r\n<p><span style=\"font-weight: 400\">Select the correct answer using the code given below<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">a) 1 and 2 only<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">b) 3 only<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">c) 1 and 3 only<\/span><\/p>\r\n<p><span style=\"font-weight: 400\">d) 1, 2 and 3\u00a0<\/span><\/p>\r\n<p><b>Ans: (d)<\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>Carbon sequestration is the process of capturing carbon dioxide from the atmosphere and storing it in natural or engineered reservoirs for extended periods. Read about its types and technologies.<\/p>\n","protected":false},"author":35,"featured_media":30005,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[38,33],"tags":[2026,40,653],"class_list":["post-29969","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-notes","category-upsc-environment-ecology-notes","tag-carbon-sequestration","tag-quest","tag-upsc-environment-ecology-notes"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/29969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/35"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=29969"}],"version-history":[{"count":3,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/29969\/revisions"}],"predecessor-version":[{"id":30012,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/29969\/revisions\/30012"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/30005"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=29969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=29969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=29969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}