寒冷化?
http://www.youtube.com/watch?v=N8fQpAhCUw0&feature=player_embedded
温暖化は人為的か?
http://www.youtube.com/watch?v=qH81JZUKUXc&NR=1&feature=fvwp
한랭화?
온난화는 인위적인가?