What does the landmark climate change accord mean for the U.S.?

From PBS NEWHOUR:
Senior Fellow for Energy and the Environment at the Council on Foreign Relations in New York Michael Levi joins Hari Sreenivasan to discuss the climate change summit deal reached in Paris. TRANSCRIPT
HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR: Earlier this evening from the White House, President Obama said the deal is a turning point that provides the architecture to save planet from the worst consequences of climate change. BARACK OBAMA, PRESIDENT OF THE UNITED STATES: No nation, not even one as powerful as ours, can solve this challenge alone. And no country, no matter how small, can sit on the sidelines. Even if all of initial targets set in Paris are met, we’ll only be part of the way there when it comes to reducing carbon from the atmosphere.