CO2 levels hit 400 ppm

A new milestone has been reached. Not has CO2 only reached 400 ppm, but the main CO2 observatory at Mauna Loa in Hawaii predicts carbon dioxide concentrations will stay above 400 ppm for the whole of 2016. 

Carbon dioxide levels will continue rising unless the world stops burning fossil fuels and chopping down forests. "The technology is there. It's just human will.", said WMO's (UN World Meteorological Organization) atmospheric environment research chief Oksana Tarasova.

A UN panel of climate scientists estimates that concentrations of carbon dioxide, methane and nitrous oxide are at their highest in at least 800,000 years. Pre-industrial levels of carbon dioxide were of 278 ppm.

Carbon dioxide is one of the main factors in climate change. Man-made warming causes for example heatwaves, downpours, droughts and rising ocean levels.