Methane is 80 times more potent than carbon dioxide in warming the Earth over a 20-year time horizon. Even as atmospheric concentrations of carbon dioxide continue to rise, despite everything our governments say they are doing to limit it, so do methane levels. This dangerous gas is now at two and a half times pre-industrial levels. Although oil and gas production, agriculture and degrading waste are known to be major producers of methane, scientists say most countries are still estimating their output and do not have accurate measurements of how much they produce. Still, stopping known sources, such as old and new leaking oil wells, would cut projected emissions in half by 2030, reducing global warming by 0.5°C by 2100. (Paul Brown)

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