When scientists talk about the greenhouse gases that are causing global warming, they typically focus on far and away the most important one, carbon dioxide — which is emitted when humans burn fossil fuels or clear forests.  The world is actually making slow progress on CO2 — there’s been no growth in annual CO2 emissions for the past three years, thanks to a slowdown in coal burning in China.

Source: Methane levels in the atmosphere are now rising at their fastest pace in decades – Vox