Of course there is a natural cycle. Carbon emissions fluctuate, global temperatures fluctuate, the world has changed considerably. But other than a few anomolies, on a large scale there are still global patterns. Ice ages have global patterns. Its a fact that atmospheric carbon and global temperatures are proportionate to each other, and the current carbon ppm is way above anything we've ever seen. There is absolutely no doubt by anyone who knows anything about the topic that it is happening. It's a shame it'll have to get to the point when it is negatively affecting everyone when it comes to necessities, like water resources, before everyone thinks... hmmmm... somethings going on. Isn't helped by the worlds rediculous population size either.