負の環境問題

http://kousin242.sakura.ne.jp/wordpress017/%E7%92%B0%E5%A2%83%E5%95%8F%E9%A1%8C/%E8%B2%A0%E3%81%AE%E7%92%B0%E5%A2%83%E9%81%BA%E7%94%A3/%E8%B6%B3%E5%B0%BE%E9%89%B1%E6%AF%92%E4%BA%8B%E4%BB%B6/