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Ralph Keeling

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Originally published in Science Alert Yet another alarming milestone of humanity’s damaging effect on the environment has now officially been reached – crossing a barrier into a hot, polluted future like the planet hasn’t witnessed in millions of years. This weekend, sensors in Hawaii recorded Earth’s atmospheric concentration of carbon dioxide (CO2) passing 415 parts per million (ppm) for the first time since before the ancient dawn of humanity. On Saturday, CO2 concentration recorded at…