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What about those other greenhouse gases?
What about those other greenhouse gases?

The U.N. Climate Summit that starts Tuesday is a precursor to the Paris climate conference scheduled for next year. No treaty will come out of the summit in New York, which is more of a brainstorming and cheerleading session. But here's one topic we'd like to see the participants discuss, because it has been given short shrift so far in the battle against global warming: what to do about methane, refrigerants and other short-lived climate pollutants. These are pollutants that don't remain in the environment for as long as carbon but are far more powerful at trapping heat. Methane, which is the most abundant and which is emitted from landfills, livestock farms and some oil...

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