The current: Coal in the crossfire

In an interview, [Jim] Hansen said tax- or market-driven efforts to reduce carbon dioxide emissions will be too little and too late to slow the chief cause of global warming. Half of the CO2 emitted to the atmosphere today will be absorbed, largely by oceans, in 25 years, but it would take 1,000 years to absorb the rest, said Hansen.
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Hansen, who first spoke about global warming to Congress 20 years ago, said he doesn't "give a lot of talks. I'm trying to maintain my credibility as a scientist."