There is high agreement in the literature that for addressing climate change risks SRM cannot be the main policy response to climate change and is, at best, a supplement to achieving sustained net zero or net negative CO2 emission levels globally . SRM contrasts with climate change mitigation activities, such as emission reductions and carbon dioxide removal , as it introduces a 'mask' to the climate change problem by altering the Earth's radiation budget, rather than attempting to address the root cause of the problem, which is the increase in greenhouse gases  in the atmosphere. In addition, the effects of proposed SRM options would only last as long as a deployment is maintained-for example, requiring ca. yearly injection of aerosols in the case of SAI as the lifetime of aerosols in the stratosphere is 1-3 years  or continuous spraying of sea salt in the case of MCB as the lifetime of sea salt aerosols in the atmosphere is only about 10 d-which contrasts with the long lifetime of CO2 and its climate effects, with global warming resulting from CO2 emissions likely remaining at a similar level for a hundred years or more  and long-term climate effects of emitted CO2 remaining for several hundreds to thousands of years .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report