I've been hopeful about this for a long time, mostly because I think its our only hope. There was a decent Nova episode on this last year: https://www.pbs.org/w

I've been hopeful about this for a long time, mostly because I think its our only hope. There was a decent Nova episode on this last year: https://www.pbs.org/wgbh/nova/video/can-we-cool-the-planet/ https://www.pbs.org/wgbh/nova/video/can-we-cool-the-planet/ It gave me some doubt, but I'm still hopeful.