Schneider, a Stanford University climatologist, said the world faces a huge risk.
"I think meters of sea-level rise are virtually inevitable, unless we can stop this. But I'm not such an optimist," he told journalists on a fellowship program with the Honolulu-based East-West Center. "The main message is we're in risk management. We do not know the science well enough to know exactly what the temperature is at when a tipping point will occur."
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