Carbon Dioxide Levels Rocketed to an Apex in April — and It's Not Stopping

As scientists expected, April became the first month in human history to have an average concentration of carbon dioxide — the main long-lived global warming gas — above 400 parts per million (ppm), according to data from a National Oceanic and Atmospheric Administration (NOAA) observatory, which sits atop a 11,000-foot-tall Hawaiian volcano

This is a symbolic but grim milestone for those who are fighting to lower global greenhouse emissions to reduce manmade global warming; as carbon dioxide levels climb, so do the risks of triggering dangerous climate change, such as the melting of land-based ice sheets and flooding of coastal cities Read more...

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Carbon Dioxide Levels Rocketed to an Apex in April — and It's Not Stopping