Who Says Humans Caused Climate Change?

Nearly all climate scientists who have published in peer-reviewed  mainstream  science journals), and all national science academies of industrialized countries agree that the warming of the Earth over the last 50 years is mostly caused by emissions of carbon dioxide from burning fossil fuels, oil, coal and natural gas.

There are scientists in other fields like physics, geography, and meteorology, who have said they are skeptical. Richard A Muller, a physicist at Berkeley said, “It’s a scientist’s duty to be properly skeptical.”

Muller considered himself a skeptic and accepted funding from the Koch brothers, (who helped fund the Tea Party) and other sources, to work with a team of scientists  at the Berkeley Earth Surface Temperature project on the evidence of human-caused climate change.

In an op-ed entitled The Conversion of a Climate-Change Skeptic  Muller explains their  conclusion that the average temperature of the Earth has risen 1.5oF over the last 50 years and “it appears likely that essentially all of this increase results from the human emission of greenhouse gases.”

They examined issues raised by skeptics, such as heat from cities, selection of data, quality of measurements, human error, solar variability, volcanic eruptions, and El Nino and they found that none of these things correlated with the pattern of rising temperatures and must be eliminated as causes of the warming climate.

Looking to the future, the Muller team predicted that Earth’s temperature will continue to rise by 1.5oF over the next 50 or even 20 years, depending on how much fossil fuel is burned.

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