Planetary-scale engineering schemes designed to cool Earth's surface and lessen the impact of global heating are potentially dangerous and should be blocked by governments, more than 60 policy experts and scientists said on Monday.
Even if injecting billions of Sulphur particles into the middle atmosphere -- the most hotly debated plan for so-called solar radiation modification (SRM) -- turned back a critical fraction of the Sun's rays as intended, the consequences could outweigh any benefits, they argued in an open letter.
