What will happen when you compare Venus to Mars? You'll find that Venus is warmer than Mars. It also receives 64 times the solar radiation.
In truth, there is some truth to global warming: about 1 degree over the past century, less than half of which is a result of CO2 "pollution". The result? Slightly warmer evenings and winters, particular in otherwise harsh, subartctic climates, resulting in massively improved harvests.
On the other hand, many people are scared of the ice caps melting. For Antarctica to melt, temperatures would have to increase ONE HUNDRED DEGREES for TEN THOUSAND YEARS!!!