Associated Press: The leaders of the United States and Japan say they "aspire" to reduce their countries’ greenhouse gas emissions by 80 percent by 2050. President Barack Obama and Prime Minister Yukio Hatoyama issued a joint statement after their meeting in Tokyo on Friday saying they "affirmed their commitment to continuing to work together to usher in a new era in the global fight against climate change." They said they agreed that shifting to low-carbon growth is indispensable to the …