Study Assess Benefits and Risks of Six Land-based Greenhouse Gas Removal Options

The International Institute for Applied Systems Analysis and collaborators have published a study in the Annual Review of Environment and Resources that evaluates the benefits and risks of six different land-based greenhouse gas removal options. The options included afforestation (establishing new forests) or reforestation (replanting previously forested areas with trees), wetland restoration, soil carbon sequestration, biochar (charcoal used as a soil amendment), terrestrial enhanced weathering (dissolution of minerals to remove CO2 from the atmosphere), and bioenergy with carbon capture and storage (BECCS). The study concluded that wetland restoration and soil carbon sequestration deliver almost exclusively positive impacts and could thus be taken up immediately. The other four options involve social and/or environmental risks that could be managed by excluding them from certain regions, areas, or environments.