so what if the temp will be warmer? So f... what?
Well, it depends by how much. There are several very nasty consequences that I can see:
1. If polar cups partially melt, that would change salinity of water. This, in turn, would change patterns of ocean currents. In particular, it can stop Golf-stream wil stop circulating and Europe will see much lower winter temperatures, changing agriculture.
Also, at some point melting the polar cups will lead to flooding of some of the cities.
2. Gulf of Mexico will be warmer leading to more frequent and stronger hurricanes -- too bad for Texas, and neighboring Southern states -- in particular, for the oil industry there.
3. At some point in the future the methane trapped in the ocean floor will get untapped and then we will really be in trouble.
And I'm not talking about tropical diseases coming our way...