Source: http://news.gallup.com/poll/106624/US-28-Report-Major-Changes-Live-Green.aspx?g_source=link_NEWSV9&g_medium=tile_6&g_campaign=item_107593&g_content=In%2520the%2520U.S.%2c%252028%2525%2520Report%2520Major%2520Changes%2520to%2520Live%2520%25E2%2580%259CGreen%25E2%2580%259D