I think humans are causing global warming. I won't put this in bold because I don't know if it is a fact, but I think the emissions from our cars is heating up the Earth. The atmosphere acts like a blanket, trapping all that gas. Sure, other things are contributing (cow burps and termite farts) but they alone wouldn't be enough to cause global warming. Have you noticed that winter came later this year? Maybe it's because of global warming.