Twenty years ago on Monday, James E. Hansen testified before the Senate Energy Committee -- in a room kept intentionally warm by committee staff -- that the atmospheric buildup of carbon dioxide and other greenhouse gases from burning fossil fuels and forests was already perceptibly influencing Earth's climate.
Then, as now, Dr. Hansen, the director of NASA's Goddard Institute for Space Studies, was pushing beyond what many of his colleagues in climatology were willing to say -- at least publicly. His...
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