Inter Press Service: The planet's climate recently reached a new milestone of 400 parts per million (ppm) of carbon dioxide in the Arctic. The last time Earth saw similar levels of climate-heating carbon dioxide (CO2) was three million years ago during the Pliocene era, where Arctic temperatures were 10 to 14 degrees C higher and global temperatures four degrees C hotter. Research stations in Alaska, Greenland, Norway, Iceland and even Mongolia all broke the 400 ppm barrier for the first time this spring, scientists...
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