I don't really believe it that much.

but if you think of it, Global Warming is starting to get pretty Serious. since when the earth gets way too hot from Global warming, the human race will die, but the earth will still survive.

that being said, the Mayans could have just predicted when the Human race will end. but, on the other hand, half of the World is trying to prevent Global Warming right now. so we'll see what happens in 3 or 4 years.