New York Times: SO far 2012 is on pace to be the hottest year on record. But does this mean that we’ve reached a threshold — a tipping point that signals a climate disaster? For those warning of global warming, it would be tempting to say so. The problem is, no one knows if there is a point at which a climate system shifts abruptly. But some scientists are now bringing mathematical rigor to the tipping-point argument. Their findings give us fresh cause to worry that sudden changes are in our future. One of them…

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