okey dokey, then. (Below is just one of many articles on this topic) I've never met an astronomer who agrees that global warming is a man-made phenomenon.
Sun's Direct Role in Global Warming May Be Underestimated, Duke Physicists Report
Durham, N.C. -- At least 10 to 30 percent of global warming measured during the past two decades may be due to increased solar output rather than factors such as increased heat-absorbing carbon dioxide gas released by various human activities, two Duke University physicists report. ....
Right, it "may" be underesitmated.
Right now, there is not dfiintive proof of the cause of global warming. There are competing theories.