How do we know that the pronounced global warming trend during the 20th and 21st century is not caused by natural cycles?
The National Academy of Science (NAS) presents a short video to explain why there is a greater than 90% chance that the global warming trend over the past 50 to 60 years is due to the burning of fossil fuels and other greenhouse gas emissions and not natural cycles.
Video courtesy of the National Research Council and YouTube.....
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