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Tag: Jeffrey T. Kiehl
Posted inClimate Science

Data from Earth’s past holds a warning for our future under climate change

Jeff Kiehl by Jeffrey Kiehl

‘Those who cannot remember the past are condemned to repeat it.’ – George Santayana Our planet’s climate recently achieved a disturbing milestone in history, with atmospheric carbon dioxide levels reaching 415 parts per million (ppm). The last time CO2 levels were so high occurred more than two million years ago during the mid-Pliocene. Over the […]