Barack Obama actually said...

I'm the first to say we've got more work to do in the years ahead.

Over the past 7½ years, we've transformed the United States into a global leader in the fight against climate change.

I know that at the G-20, we're committed to working with other countries to build sustainable, inclusive economies and create opportunities ...

Together, the U.S. and China represent about 40 percent of global emissions.