The evidence of climate change can be seen in today's bizarre weather patterns. Increased hurricanes and typhoons, increased floods, increased droughts, increased brush fires, disappearing ice in the arctic. We don't need to see temperature data for 100 years to tell us there is a problem. There are naysayers who claim this is a natural cycle, many of these people have a lot to lose if we use less oil. Who wants to take the risk and do nothing? What if climate change is confirmed by temperatures going up 5 C? By the time that happens it's too late to do anything.
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