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Why it’s important that we know that we’re at 400 ppm of CO2

Issues & Causes / Environmentalism : Legal Planet: Environmental Law and Policy

A major (and unfortunate) milestone has been crossed this past week.  Measurements of atmospheric levels of carbon dioxide passed 400 parts per million, the highest in millions of years.  Others have commented on how worrying this m...

Climate One-Two Punch: During the Hottest Year Ever, the World May Never Return Below 400ppm CO2

Issues & Causes / Climate Change : Greentech Media

Climate Central: The World Passes 400 PPM Threshold. Permanently In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world’s climate. At a time when atmospheric carbon dioxide...

Carbon Dioxide Passes 400 PPM Milestone, NOAA Finds

Politics / US Politics : The Moderate Voice

Carbon Dioxide Passes 400 PPM Milestone, NOAA Finds (via Climate Central) By Andrew Freedman Follow @afreedma On May 9, the amount of carbon dioxide in the air exceeded 400 parts per million (ppm) for the first time in the observati...

The World's Carbon Dioxide Levels Just Hit a Staggering New Milestone

Issues & Causes / Environmentalism : Blue Marble

The monthly global average concentration of carbon dioxide just broke 400 parts per million for the first time since record-keeping of greenhouse gas levels began. #CLIMATE NEWS: Global #CO2 concentrations surpass 400 ppm for 1st mo...

WATCH: What Does 400 ppm Mean? Talking with Climate Scientist Michael Mann

Issues & Causes / Environmentalism : Blue Marble

Last week in Washington, DC, leading climate scientist Michael Mann of the University of Pennsylvania sat down with Climate Desk Live to talk about the significance of an planetary milestone—we've reached 400 parts per million of ca...

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