Source: http://news.gallup.com/poll/106660/Little-Increase-Americans-Global-Warming-Worries.aspx?g_source=link_NEWSV9&g_medium=tile_6&g_campaign=item_107569&g_content=Little%2520Increase%2520in%2520Americans%25E2%2580%2599%2520Global%2520Warming%2520Worries