Fellows in the News

Last year marked the first time in several million years that atmospheric concentrations of CO2 passed 400 parts per million. By looking at what Earth’s climate was like in previous eras of high CO2 levels, scientists are getting a sobering picture of where we are headed.

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Each landmark event has given scientists and environmentalists a reason to restate their worries about what humans are doing to the climate. “Reaching 400 ppm is a stark reminder that the world is still not on a track to limit CO2 emissions and therefore climate impacts,” said Annmarie Eldering, deputy project scientist for NASA’s Orbiting Carbon Observatory-2 satellite mission at the Jet Propulsion Laboratory. “Passing this mark should motivate us to advocate for focused efforts to reduce emissions across the globe.

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