Global carbon dioxide levels break 400ppm milestone

(guardian-, 6 May 2015) Concentrations of CO2 greenhouse gas in the atmosphere reached record global average in March, figures show, in a stark signal ahead of Paris climate talks.

Record carbon dioxide (CO2) concentrations in the atmosphere were reported worldwide in March, in what scientists said marked a significant milestone for global warming.

Figures released by the US science agency Noaa on Wednesday show that for the first time since records began, the parts per million (ppm) of CO2 in the atmosphere were over 400 globally for a month.

The measure is the key indicator of the amount of planet-warming gases man is putting into the atmosphere at record rates, and the current concentrations are unprecedented in millions of years.

External link

guardian-, 6 May 2015: Global carbon dioxide levels break 400ppm milestone