Cloud cover
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Cloud cover is a sorely neglected factor in debates over global warming.
Richard Lindzen wrote:
- Cloud cover in models is poorly treated and inaccurately predicted. Yet clouds reflect about seventy-five watts per square meter. Given that a doubling of carbon dioxide would change the surface heat flux by only two watts per square meter, it is evident that a small change in cloud cover can strongly affect the response to carbon dioxide. [1]