Some say that humans have not caused global warming to speed up.

Seaville - Some say that humans have not caused global warming to speed up. It's true that the earth goes through these changes but one thing is different during this change, humans. Heat from over a billion humans, exhaust from combustible machines, countless smoke stacks around the globe, man-made fires, solar arrays, heat from decomposing trash dumps, and many other human-made heat sources are real. They weren't on this planet since day one. But they are here now and it's taking its toll on this planet.