US, China least concerned about climate change, poll finds

China and the United States are the world's biggest polluters, but their residents are among the least concerned about the harms of climate change, a global poll found Thursday. Just 18 percent of those surveyed in China said climate change is a very serious problem, and 15 percent were very concerned that climate change would harm them personally, according to the Pew Research Center. In the United States, 45 percent said climate change was very serious, and one in three expressed concern about