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Elizabeth Kolbert: Obama’s Keystone Decision »
Carbon-dioxide levels have increased every year, and earlier this month they reached the milestone of four hundred parts per million. No one knows exactly when levels were last this high; the best guess is the mid-Pliocene, about three million years ago, when sea levels were some seventy-five feet higher. President Obama will make a decision in the next few months about whether to approve the Keystone XL pipeline. The latest figures reveal what’s at stake. Source Main page (current trends)
More about: Elizabeth Kolbert, Keystone Decision, President Obama, sea levels