A new study is punching holes in the alternative theory that recent global warming is not caused by human activity but by solar radiation, claiming the sun's radiation has been decreasing over the last 25 years. Examining solar radiation records over the last 11 years, British scientists found that total radiation from the sun peaked in 1985, meaning that the solar radiation hitting the planet has actually subsided during the 20 years of increased global temperatures. "The sun did a U-turn around 1985, but the temperatures kept on rising," Lockwood, a solar physicist at the Rutherford Appleton Laboratory. "Everything on the sun that could have affected climate has been going in the wrong direction to cause warming, and we've seen continued warming"


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