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Armed with the very real evidence of the global cooling trend during the first half of the 20th century, climate alarmists claimed in the 1970s that another ice age was imminent. Today they (including even some former proponents of a coming ice age, e. g.: Stephen Schneider), ride a wave of alarm about man-made catastrophic global warming, a wave of alarm they created and keep fueling .
Objective scientists find that the evidence supporting a man-made global warming trend is at best skimpy. However, it cannot and should not be denied that climate changes take place and that they have done so since long before man even made an appearance on Earth.
Based on many different indicators from widely varying sources, it has been found that our sun, a variable star, is a major and controlling influence on the extent and rate of long- and short-term climate changes affecting Earth. In a January 17, 2003 article, Science@NASA describes the extent of the fluctuations in solar radiation over time, how they are being measured, the instruments that are being used to measure them, how those instruments are being calibrated and what has been found by using them. The following graph is from that article. (SEE ABOVE)
That appears to be ample evidence of variations in solar radiation, but it does not explain what causes them. If the causes of the variations were to be determined and if it were possible to use knowledge about them to predict the trends of the variations in solar radiation, that would permit to forecast trends for climate change. Some climate researchers are hard at work to do just that.
Earth is heating up lately, but so are Mars, Pluto and other worlds in our solar system, leading some scientists to speculate that a change in the sun's activity is the common thread linking all these baking events.
Others argue that such claims are misleading and create the false impression that rapid global warming, as Earth is experiencing, is a natural phenomenon.
While evidence suggests fluctuations in solar activity can affect climate on Earth, and that it has done so in the past, the majority of climate scientists and astrophysicists agree that the sun is not to blame for the current and historically sudden uptick in global temperatures on Earth, which seems to be mostly a mess created by our own species.