In the context of reaching the long-term global temperature goal of the Paris Agreement, there are different hypothetical scenarios of SRM deployment: early, substantial mitigation with no SRM, more limited or delayed mitigation with moderate SRM, unchecked emissions with total reliance on SRM, and regionally heterogeneous SRM. Each scenario presents different levels and distributions of SRM benefits, side effects and risks. The more intense the SRM deployment, the larger is the likelihood for the risks of side effects and environmental risks . Regional disparities in climate hazards may result from both regionally deployed SRM options such as GBAM, and more globally uniform SRM such as SAI . There is an emerging literature on smaller forcings of SAI to reduce global average warming, for instance, to hold global warming to 1.5℃ or 2℃ alongside ambitious conventional mitigation , or bring down temperature after an overshoot . If emissions reductions and CDR are deemed insufficient, SRM may be seen by some as the only option left to ensure the achievement of the Paris Agreement's temperature goal by 2100.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report