(This is in response to Zach Mitcham’s July 24 opinion column: “We need sound policy, not political punching bag, on global warming.”)
Global warming arrived in reports of a dramatic temperature increase between mid-1990 and mid-2000. This rise in temperature implied that more heat was received from the sun than radiated back into space. The concept of greenhouse gas was developed to explain this phenomenon and anthropogenic (man-made) CO2 appeared to be the only atmospheric component increasing in that time frame.
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