In May 2013, it was big news when, for the first time, the concentration of carbon dioxide in the atmosphere hit 400 parts per million. Now, researchers say that number has been consistently above 400 for the last month.
“This is higher than it’s been in millions of years,” said Pieter Tans, a senior scientist with the National Oceanic and Atmospheric Administration’s Climate Monitoring and Diagnostics Laboratory.
Parts per million, or ppm, is a measure of the ratio of carbon dioxide to other gases in the atmosphere. Carbon dioxide is just one type of greenhouse gas that has been found …read more
Source: Huffington Post Green