I am not at all knowledgeable about how sunspots affect climate. They definitely affect radio propagation. My first sunspot peak was in '89. I thought they would all be like that. I worked DX on 10m (28MHz) well into the night. 2000 wasn't as intense. 2011 was even less so. I moved and haven't put an antenna since 2011. I should put one up, maybe something for low frequencies, which propagate slight better (according to folklore) in low sunspot times.

Regarding the point about deforestation, I'm unclear how much it affects the carbon cycle because I imagine much of the carbon captured gets released eventually. Intuitively, though, it's a doubly whammy of increasingly global warming and hasting the current mass-extinction event. I would guess the decreased bio-diversity would be more costly than its contribution to climate change, but that's a wild guess.

The number one source of climate is the Sun - not the planet. I just shake my head when people don't immediately look at the Sun as the cause of most climate events. Back in the late 80's and 90's El Nino and La Nina at least got that part right in acknowledging that it was the sun's energy which created the hot spots in the Pacific in the first place. Nowadays "scientists" have abandoned rational thinking in favor of their next grant.