Some scientists argue solar geoengineering may be needed to slow warming, while critics warn it could trigger geopolitical conflict and dangerous unintended consequences.
Climate geoengineering refers to deliberate large-scale interventions in Earth's climate system, usually divided into carbon dioxide removal (CDR), which tries to pull greenhouse gases out of the atmosphere, and solar radiation modification (SRM), which would reflect a small fraction of sunlight to cool the planet. The most controversial emergency-fix proposal is stratospheric aerosol injection, inspired partly by the temporary global cooling observed after major volcanic eruptions such as Mount Pinatubo in 1991.
The loudest debate often blurs very different technologies. Carbon removal is already embedded in many net-zero scenarios, while solar radiation modification remains largely theoretical and politically radioactive. Even within SRM, small outdoor experiments, computer modeling, and full deployment have very different risk profiles, yet they are often discussed as if they are the same act.
Some scientists see solar radiation management as a last-resort climate tool, while critics fear unpredictable harms and a dangerous excuse to delay emissions cuts.
Proposals to dim sunlight could slow warming, but opponents warn it risks planetary side effects, moral hazard and geopolitical conflict.
The push to phase out fossil fuels faces fierce resistance from consumers, industry and governments worried about prices, jobs and grid reliability.
The push to decarbonize transport and energy is colliding with consumer costs, grid concerns, industry lobbying and culture-war resistance.