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If you are going to discuss global warming, you need to discuss what is causing it. 97% of the scientists in the world today will tell you it is CO2 levels. Since the CO2 levels are off the chart today, we have just had the hottest year on record. And as Roger Revelle, one of the pioneers in global warming studies told us, they act together. That is how Al Gore got involved in global warming studies. Roger Rovelle was his college professor.