607136 external_news 1529339891 1529339891 We were warned. On June 23, 1988, a sultry day in Washington, James Hansen told Congress and the world that global warming wasn't approaching — it had already arrived....Thirty years later, it's clear that Hansen and other doomsayers were right. But the change has been so sweeping that it is easy to lose sight of effects large and small — some obvious, others less conspicuous.… "It would take centuries to a millennium to accomplish that kind of change with natural causes. This, in that context, is a dizzying pace," said Kim Cobb, a climate scientist at Georgia Tech in Atlanta, a professor in the School of Earth and Atmospheric Sciences.   

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