Climatologist wolfgang cramer says we " risk losing the entire amazon " if global warming reaches 4 degrees .
气候学家沃尔夫冈克拉默说，如果全球变暖达到4度，我们“有失去整个亚马逊的风险”。
Sceptics sometimes seem to draw comfort from this natural variability but , to a climatologist with a sense of history , the wild swings in the past are anything but comforting .
And this month , a second panel at penn state university exonerated michael mann , a prominent climatologist and faculty member , of scientific wrongdoing .
If this sounds like hyperbole , listen to professor jim hansen , the world 's leading climatologist , whose predictions have consistently turned out to be correct .
