If you have viewed the top ten rankings of the least green states in the U.S., here is the list featuring the top ten greenest states. Similarly, the rankings are based on 24/7 Wall St.’s data analysis on environmental issues facing each state including energy consumption, pollution problems and state energy policies. Huffington Post has updated the 24/7 Wall St. rankings from last year to reflect the most recent data issued in 2000 and 2010.