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The Earth has always been heating up and cooling off. How do you think the Ice Age started and ended? This is a natural occurance. This process has been going on for millions of years. The ice caps are melting, and when they're done, they'll freeze right back up. It's Earth's natural processes.
Also, there have been cases where all these temperature measurements are inaccturate because they were measured near places that give off a lot of heat. (An example would be by asphalt, large electrical machienery, and roof-tops. All these places give off and refelct a lot more heat than natural palces.)
Hybrids will reduce Co2 emmissions, but the warming will still happen. WE CAN'T STOP IT!
By the way, Polar Bears are not drowning. They are excellent swimmers.