Methane: Where it comes from and why we’re running out of time

Emissions and atmospheric concentrations of methane continue to increase, making it the second most important human-influenced greenhouse gas in terms of climate forcing after carbon dioxide. In fact, methane concentrations have risen faster over the past five-year period than in any period since record-keeping began, and yet research suggests that reducing methane emissions may be cheaper than carbon dioxide mitigation for a comparable climate benefit.

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