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Winding 1,387 miles through some of North America's most extreme environments, it was the most ambitious construction project since the Panama Canal and built to defend a continent.
The shift of subarctic forests and peatlands from a CO2-absorbing sponge to a net source of the gas means that these regions could help trigger accelerated global warming, the study warned.
Climate-warming-induced acceleration of CO2 emissions through enhanced respiration of centuries-to-millennia-old peat deposits may form a strong positive feedback to our climate. But the long-term ...