Climate Change Summit Leaves Hope for Limiting Global Warming

Governments left the United Nations climate summit this month with new doubts that global temperature increases can be limited to 1.5 degrees Celsius from preindustrial levels—but also with hope that a more realistic goal, 1.7 degrees, is within reach. The target of 1.5 degrees Celsius—or 2.7 degrees Fahrenheit—has been the north star of U.N. climate negotiations since it was enshrined in the 2015 Paris accord. The deal calls for governments to cut greenhouse-gas emissions to levels that climate scientists estimate can limit warming to well below 2 degrees Celsius compared with preindustrial levels, with the ambition of keeping it below 1.5 degrees.

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