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Putting CO2 to Use: Creating Value from Emissions Technical analysis developed standardised techno-economic assessment and LCA methodologies for CO2 use (Zimmermann et al., 2018). In 2018, the IEA Greenhouse Gas R&D Programme (IEAGHG) published a report setting out an initial methodological approach for compiling a greenhouse gas (GHG) emissions inventory for CO2-derived products, including a CO2 benefits assessment methodology (IEAGHG, 2018). The US National Energy Technology Laboratory has recently published a document to provide guidance, data, and tools for LCAs of CO2 use applications (Skone et al., 2019). In 2017 the European Union launched a process for benchmarking LCA approaches and methodologies for CO2 use applications. Its aim was to establish a common understanding for a sound basis for LCA work and to improve the comparability of the various studies. The initiative is presently on hold. Origin of the CO2 CO2 can be taken from several sources: natural underground deposits where CO2 has accumulated over millions of years; anthropogenic CO2 from power plants or industrial facilities, including the combustion or processing of fossil fuels, biomass or other materials; or directly from the air. Not all sources of CO2 are equally attractive from a climate perspective. The use of CO2 from natural deposits should be avoided as it ultimately results in higher CO2 emissions than if using anthropogenic sources or CO2 from DAC. CO2 use from these sources can deliver climate benefits, but these benefits depend on the potential for displacement of higher-carbon alternatives (which will change over time as key sectors are decarbonised) and whether or not the carbon is permanently stored in the product. In principle, the use of CO2 from fossil energy and industrial sources, such as cement and iron and steel manufacturing, can be used in the production of fuels and chemicals to deliver climate benefits. Each carbon molecule is being used twice: the carbon contained in a fossil fuel is used to produce energy or in an industrial production process, and then the resulting CO2 is used in combination with hydrogen to produce a carbon-containing fuel or chemical. However, such a system would still involve emissions of CO2 from fossil fuels. From an energy system’s perspective, products or services derived from fossil or industrial CO2 can achieve a maximum emissions reduction of 50% (Bennett, Schroeder and McCoy, 2014). This is because CO2 can only be avoided once: either it can reduce the emissions from the fossil or industrial source when it was captured or it can reduce the emissions of the final product or service (Figure 19). It cannot do both.8 As a crude example, if 1 MtCO2 per year is captured from a coal-fired power plant and converted to a fuel with the same energy and carbon content as the fossil fuel it displaces, 1 MtCO2 is later released when the fuel is combusted. This system has annual emissions of 1 MtCO2 and it displaces a system that produces electricity and fuel separately with combined emissions of 2 MtCO2 per year.9 8 While emissions reductions could be shared, it is not possible to fully reduce the emissions of both point sources. 9 In this simplified case, it is unrealistically assumed that all upstream and direct emissions (from capture, purification, transport and processing of the CO2, including supply of other raw materials such as hydrogen, and the production of the displaced fuel) have no associated emissions. PAGE | 34 IEA. All rights reserved.PDF Image | Putting CO2 to Use Creating value from emissions
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