The three ingredients necessary for life as we know it are water, heat, and carbon.
Global warming increases all three.
If it were true that humans were causing it, animals should be so full of gratitude, they should volunteer to let us eat them. (Hell, we're going to do it anyway.)
No doubt Global warming has some benefits. What we don't want though is a hole in the Ozone layer. I've been to the south island of New Zealand and the atmosphere is so thin there that the light is like daggers in your eyes. CO2 yes, CFS's no.