If there is any warming and there is an increase in carbon dioxide, it’s going to benefit life on Earth.
Pretty simple to understand, average temp 57 F so temps on earth above and below, moderated by air and ocean circulation and dilutional effects at the extremes.
So let’s say it goes to 59, may increase growing seasons at the higher latitudes, won’t have an effect on high temps as much as moderation of temps.
Poles will still be freezing, just less. tropics still hot without much change in extremes, moderated by humidity and water state changes to vapor and back at higher altitudes.
Probably some increase in water vapor circulation due to a slightly warmer general climate.
http://news.heartland.org/newspaper-article/2014/03/25/benefits-global-warming-greatly-exceed-costs-new-study-says
I certainly look forward to some warming. It was 45F here in central Florida this morning.