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Oct.11 -- We all know the impact of CO2, but what about the other greenhouse gas: methane? It's produced by industries from agriculture to oil and gas, and is the cause of 28% of all human-caused climate change. In this edition, we speak to Claus Zehner of the European Space Agency, spotting from emissions from space, and the methane hunters of the Permian Basin, who hold fracking companies to account for the invisible pollutant. Plus, how can the international community stop the authoritarian state of Turkmenistan from leaking tonnes of methane into the atmosphere?