Listening to Mr. Kappus' lecture on Climate Change in the Scientific Controversies class of OLLI this past week, I culled out 3 important reasons for thinking humans have greatly affected the earth's climate change cycle:
1. There's been a noticeable rise during an earth's temperature cooling phase since the coming of the Industrial Revolution that brought about industry's usage of fossil fuels for energy--CO2 and CO4.
2. We're now experiencing an even sharper rise in temperature for which there's no other explanation as obvious as we earthlings are relying on fossil fuels at an ever increasing rate.
3. Scientists have been able to reproduce this phenomenon in its "greenhouse experiments."
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