United Press International: U.S. President Obama and Japanese Prime Minister Yukio Hatoyama recommitted to reduce their countries’ emissions by 80 percent by 2050, the White House said. Obama and Hatoyama, meeting in Tokyo, issued a joint message about climate change negotiations and also recognized each country’s achievements in attaining the shared goal, the statement said. The two leaders also reaffirmed moving to low-carbon growth is key to the planet’s health and would play a vital role in reviving …