Jessica T. Mathews, Tom Burke and Laurence Tubiana on what the EU and the U.S. need to do to address climate change.

Expectations are running high for major changes in the next U.S. administration's foreign policy, but how much change is likely, and will it be enough to close the gap between America and the world? Top experts from the Carnegie Endowment and elsewhere discussed this question during a two-day conference in Brussels.