Natural variation in weather and climate is tremendous. Most of what people call “global warming” is natural, not man-made. The earth is warming, but not quickly, not much, and not lately but there is tremendous uncertainty as to how the climate really works. Climate models are not yet skillful; predictions are unresolved, even new research shows fluctuations in energy from the sun correlate very strongly with changes in earth’s temperature, better than CO2 levels.
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well 97% of scientifics agree is man-made..
variations in sunlight, volcanic eruptions, CO2 levels has also caused global warming but i think that's millions of years ago...But recently scientist believe that over 90% of human activity has caused more recent global warming.