In what is being hailed as a landmark agreement, China and the US both agreed to limit carbon emissions. US President Obama announced on November 11, 2014, that the United States would emit 26 percent to 28 percent less carbon in 2025 than it did in 2005. That is double the pace of reduction it targeted for the period from 2005 to 2020. Setting a more ambitious target, China pledged to reach peak carbon emissions by 2030, if not sooner. To reach that goal, Xi Jinping pledged that so-called clean energy sources, like solar power and windmills, would account for 20 percent of China’s total energy production by 2030.