We humans are not to blame. Well not soley anyway. Okay yes were doing it now by creating such big carbon footprints but global warming is a natural thing if any simple person with a brain can see that throughout the earths history it has happened many times.

Example - Scientists now think intense global warming, caused by a meteor killed the dinosaurs, not just a meteor. So anyone who says global warming is all us humans fault can get on their bike and kindly sod off