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1. Introduction and framework of this report Technical Summary 19 emissions’) by capturing and storing the atmospheric CO2 taken up by the biomass, provided the biomass is not harvested at an unsustainable rate. Carbon dioxide capture and storage (CCS), the subject of this Special Report, is considered as one of the options for reducing atmospheric emissions of CO2 from human activities. The purpose of this Special Report is to assess the current state of knowledge regarding the technical, scientific, environmental, economic and societal dimensions of CCS and to place CCS in the context of other options in the portfolio of potential climate change mitigation measures. Figure TS.1 illustrates the three main components of the CCS process: capture, transport and storage. All three components are found in industrial operations today, although mostly not for the purpose of CO2 storage. The capture step involves separating CO2 from other gaseous products. For fuel- burning processes such as those in power plants, separation technologies can be used to capture CO2 after combustion or to decarbonize the fuel before combustion. The transport step may be required to carry captured CO2 to a suitable storage site located at a distance from the CO2 source. To facilitate both transport and storage, the captured CO2 gas is typically compressed to a high density at the capture facility. Potential storage methods include injection into underground geological formations, injection into the deep ocean, or industrial fixation in inorganic carbonates. Some industrial processes also might utilize and store small amounts of captured CO2 in manufactured products. The structure of this Technical Summary follows that of the Special Report. This introductory section presents the general framework for the assessment together with a brief overview of CCS systems. Section 2 then describes the major sources of CO2, a step needed to assess the feasibility of CCS on a global scale. Technological options for CO2 capture are then discussed in Section 3, while Section 4 focuses on methods of CO2 transport. Following this, each of the storage options is addressed. Section 5 focuses on geological storage, Section 6 on ocean storage, and Section 7 on mineral carbonation and industrial uses of CO2. The overall costs and economic potential of CCS are then discussed in Section 8, followed by an examination in Section 9 of the implications of CCS for greenhouse gas emissions inventories and accounting. The Technical Summary concludes with a discussion of gaps in knowledge, especially those critical for policy considerations. The technical maturity of specific CCS system components varies greatly. Some technologies are extensively deployed in mature markets, primarily in the oil and gas industry, while others are still in the research, development or demonstration phase. Table TS.1 provides an overview of the current status of all CCS components. As of mid-2005, there have been three commercial projects linking CO2 capture and geological storage: the offshore Sleipner natural gas processing project in Norway, the Weyburn Enhanced Oil Recovery (EOR)1 project in Canada (which stores CO2 captured in the United States) and the In Salah natural gas project in Algeria. Each captures and stores 1–2 MtCO2 per year. It should be noted, however, that CCS has not yet been applied at a large (e.g., 500 MW) fossil-fuel power plant, and that the overall system may not be as mature as some of its components. Overview of CO2 capture and storage CO2 is emitted principally from the burning of fossil fuels, both in large combustion units such as those used for electric power generation and in smaller, distributed sources such as automobile engines and furnaces used in residential and commercial buildings. CO2 emissions also result from some industrial and resource extraction processes, as well as from the burning of forests during land clearance. CCS would most likely be applied to large point sources of CO2, such as power plants or large industrial processes. Some of these sources could supply decarbonized fuel such as hydrogen to the transportation, industrial and building sectors, and thus reduce emissions from those distributed sources. CCS involves the use of technology, first to collect and concentrate the CO2 produced in industrial and energy- related sources, transport it to a suitable storage location, and then store it away from the atmosphere for a long period of time. CCS would thus allow fossil fuels to be used with low emissions of greenhouse gases. Application of CCS to biomass energy sources could result in the net removal of CO2 from the atmosphere (often referred to as ‘negative 1 In this report, EOR means enhanced oil recovery using CO2 .PDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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