2. Gary Cohn, the White House economic adviser, told ministers from several major allies that the Trump administration would pull out of the Paris climate deal unless it was revised. But exactly what changes would suffice was unclear.

Some U.S. governors are also in New York this week, to speak directly with U.N. and world leaders about climate change. Above, a coal-fired plant in Georgia.

Our reporter set out to answer the question on many minds: Is climate change responsible for the extreme weather we’ve been seeing? (An example from her findings: Climate change doesn’t cause hurricanes, but it can make them stronger.)

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