[jkn]

If you consider Nature in general, nothing is good or bad. Colder is better for organisms that prefer cold, warmer for those that prefer warm. No life at all might be best for the geological (or should I say areological) wonders on Mars.

Ethically speaking, I think most climate change "alarmists" (what is the equivalent word with positive connotation?) are either worried for the species that will go extinct, or the poorer humans that will suffer the most from it.

[whytaka]

I think people are more worried about irregularities in the weather system we've come to rely upon. Our agriculture depends on it.