Since the first Earth Day, the planet’s CO2 levels have gone off the rails

When Americans celebrated the first Earth Day on April 22, 1970, the planet's atmosphere was markedly different than it is today. Nearly 50 years ago, scientists measured Earth's levels of carbon dioxide — the planet's most important greenhouse gas — at around 325 parts per million, or ppm. 

Now, almost five decades later, that number has shot up to around 412 ppm, nearly 90 ppm higher. It's a change atmospheric researchers, geologists, and climate scientists call unparalleled in at least 800,000 years, though it's likely carbon dioxide levels haven't been this high in millions years. 

"The rate of CO2 increase since the first Earth Day is unprecedented in the geologic record," said Dan Breecker, a paleoclimatologist at The University of Texas at Austin. Read more...

More about Global Warming, Carbon Dioxide, Climate Change, Carbon Emissions, and Earth Day

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