Organiser: Pete Smith (University of Aberdeen)
A majority of IPCC scenarios show that often very significant amounts (20 Gt CO2e/yr) of Greenhouse Gas Removal technologies (GGRs) are required to reach a 2°C target by 2100. Given that most models fail to reach a 2°C target without GGRs, it seems impossible that the aspirational target of 1.5°C of the Paris Agreement could be met without GGRs. The global potential, feasibility, barriers and impacts of GGRs need to be assessed.
The global implications of widespread implementation of GGRs on land competition, greenhouse gas emissions, physical climate feedbacks (e.g. albedo), water requirements, nutrient use, energy and cost, have recently been assessed. It appears that sequestration in soils and vegetation have significant potential for GGR, and may do so with much less competition for land, water and nutrients than, for example, Bioenergy with Carbon Capture and Storage (BECCS). In addition, soil and vegetation-based GGRs could help deliver other Sustainable Development Goals (SDGs), particularly 1, 2, 13 and 15 (poverty, hunger, climate and life on land). Yet constraints due to high uncertainties about the level of GGR achievable, the need for site-specific options and incentives, social and ecological impacts, and the risk of impermanence have limited the implementation of soil and vegetation-based GGR to date.
This session will examine the potential for carbon sequestration in vegetation and soils as GGR options, and assess their impacts, the biophysical, economic and social limits to their implementation and possible synergies with delivering the UN SDGs.