U.S. President Barack Obama and China’s President Xi Jinping (L) hold a joint news confernce in the Rose Garden of the White House in Washington September 25, 2015. – Tensions between the United States and China are running high on issues including cyber security, the South China Sea and currency values. So why are the U.S. and China working so well together on climate change? And what does it mean for the world? Today, President Barack Obama and President Xi Jinping announced an important climate agreement. If that sentence sounds familiar, there’s a reason. At their first summit (in California in 2013), President Obama and President Xi announced plans to cooperate in phasing out HFCs, a super-pollutant with huge global warming impacts. At their second summit (in Beijing in 2014), the two leaders reached an historic agreement to limit total emissions of heat-trapping gases in each country. Expectations for […]