Carbon dioxide definition11/29/2023 1 2 Carbon dioxide removal ( CDR ), also known as carbon removal, greenhouse gas removal ( GGR) or negative emissions, is a process in which carbon dioxide gas (CO 2) is removed from the atmosphere by deliberate human. Fossil fuel transfers carbon from the slow domain to the fast domain, while bioenergy systems operate within the fast domain. Planting trees is a nature-based way to temporarily remove carbon dioxide from the atmosphere. *IPCC distinguishes between the slow domain of the carbon cycle, where turnover times exceed 10,000 years, and the fast domain (the atmosphere, ocean, vegetation and soil), vegetation and soil carbon have turnover times in the magnitude of 1– 100 and 10– 500 years, respectively. Instead, the biogenic carbon flows and any fossil GHG emissions associated with the bioenergy system need to be compared with the GHG emissions associated with the energy system displaced, considering also biogenic carbon flows in the absence of the bioenergy system. The net greenhouse gas (GHG) outcome of using biomass for energy cannot be determined by comparing emissions at the point of combustion. In other words, fossil fuel use increases the total amount of carbon in the biosphere-atmosphere system while bioenergy systems operates within this system biomass combustion simply returns to the atmosphere the carbon that was absorbed as the plants grew.* However, statements like “the use of woody biomass for energy will release higher levels of emissions than coal” overlook the fundamental difference between energy supply from fossil fuels and from biomass: burning fossil fuels releases carbon that has been locked up in the ground for millions of years, while burning biomass emits carbon that is part of the biogenic carbon cycle. In fact, it is perfectly true that a bit more CO 2 is released per unit energy from biomass than from black coal – this is purely a consequence of the chemical composition of biomass and coal. There have even been headlines in the media claiming that “biomass is worse than coal”. Some people are puzzled about how bioenergy can contribute to climate change mitigation because burning biomass emits carbon dioxide (CO 2). Carbon dioxide (CO 2) is the most significant greenhouse gas.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |