Blocking Out the Sun to Fight Climate Change

David Keith, a Harvard physicist, is researching solar geoengineering, a method to cool the Earth by spraying reflective particles into the atmosphere. While it could quickly reduce global temperatures, the technology is controversial, especially in the US, due to concerns about its impact on emission reduction efforts. Keith's lab simulates stratospheric conditions to test materials like diamond dust. Despite its potential, geoengineering is not a permanent solution and poses unknown risks. It may be a necessary temporary measure if emission cuts fail to curb climate change effectively.

What challenges does David Keith face in conducting research on solar geoengineering?

Discuss the implications of using solar geoengineering as a temporary solution to climate change.