Can we stop global warming?

It is almost daily that television news mention environmental and natural disasters in each area of the world. Thus, the recent environmental events in the last years were cyclones like Katrina, tsunamis, floods, drynesses… Scientifics don’t give a verdict on these events but public opinion attributes them to global change and particularly to global warming.
Global warming refers to the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.
In which measure the controversies and the actual debates about global warming make the ecological message and the environmental politics difficult?