Is there or isn't there?

The President says, "Have no fear, there is no such thing as global warming. It's all a bunch of hooey by tree-hugging, paranoid environmentalists trying to scare the citizens of the world. Look at the northeast - getting the coldest temperatures on record in decades!"

The scientists say, "It's already too late. Global warming is occuring. Now all we can do is lower our carbon emissions and make changes to better manage the rising temperatures."

Who do you think is correct? And why is it turning into a such big deal? Who cares, right?