We now know that this phenomonon has naturally occured many times before by simply looking at patterns in volcanic and solar activity over a period of several million years. Besides, planet Earth is simply too complicated to measure with today's scientific methods, because they don't take into account factors like cloud cover, recent solar/volcanic activity, temperature variations between urban and rural areas, and carbon dioxide absorption by plants.
If everyone decided to stop polluting in an effort to stop global warming, it still wouldn't make much of a difference if a volcano suddenly erupts or the sun releases a plume of energy into space.
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