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PBS News Hour
Are the G-7 pledges to combat climate change enough?
As carbon emissions build up in the atmosphere more than ever before in human history, western leaders at the Group of Seven summit pledged to reduce their use of coal, lower their overall emissions, and help nations most impacted by climate change. But are their pledges enough? William Brangham examines the issue with Rachel Kyte, dean of the Fletcher School at Tufts University.
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