Many questions regarding the role of CO2 in past climate changes are being answered. The reason is that we are now documenting the consequences of burning coal, petroleum and natural gas. The late Roger Revelle called it “man’s greatest geophysical experiment.” And that it is, for our ability to predict the outcome accurately remains marginal. We know that mountain glaciers are retreating, that Arctic sea ice is thinning, and that Greenland’s outlet glaciers are retreating, but the uncertainties in the predictions of how rapidly sea level will rise remain extremely large. We know that coral reefs are being bleached....

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