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December 4, 2019

Many internal and external factors impact the earth's temperature, its sensitivity to increases or declines in greenhouse gas levels it just one.

Understanding the earth's climate, and the myriad factors, including but not solely greenhouse gases, that influence the earths temperature and climatic responses to temperature increases and declines is complex. This paper examines the greenhouse effect and concludes at current or reasonably expected levels, anthropogenic increases in greenhouse gases do not threaten catastrophe. 
Richard Lindzen, Ph.D. is an Emeritus Professor of Meteorology, Massachusetts Institute of Technology
Dr. Roy Spencer was a Senior Scientist for Climate Studies at NASA’s Marshall Space Flight Center, where he and Dr. John Christy received NASA’s Exceptional Scientific Achievement Medal for their global temperature monitoring work with satellites. @RoyWSpencer