ANSWERS: 3
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Methane
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Methane is a more powerful greehouse gas than carbon dioxide. I am unaware of which is having more of an effect but I would guess CO2 (due to volume). Not a climatologist sorry!
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Water (vapor). By far. (counting total effect over the whole planet). Of course, the water vapor was there all along, so it's not that we're trying to reduce but other gases.
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