In 1975, geologist Wallace Broecker penned a scientific paper warning about the still little-discussed concept of “global warming.” Forty-four years later Broecker has died at 87, but not before proving himself a legendary earth scientist, repeatedly underscoring that amassing carbon dioxide in the atmosphere has stoked relentless climate change.

Ancient air found in ice cores proves, indisputably, that Earth’s carbon dioxide (CO2) concentrations are the highest they’ve been in at least 800,000 years

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