Global Warming – Natural vs. Manmade Causes Compared By NASA | Video

When you compare possible natural causes (orbital, solar and volcanic activity) over the course of the last 100+ years, to possible manmade causes (aerosols, deforestation and greenhouses gases), the winner is clear. Greenhouse gases directly correlate to an increase in Earth temperature.

Credit: NASA/GSFC GISS
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They build transparent boxes, fill some with CO2 and methane, then monitor temperature differences.
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