Historical clue formulations

• Deforestation, for example — 2021-11-21
• Environmental destruction — 2019-05-14
• Green curtains? — 2016-06-04
• Pouring poison into a stream, e.g. — 2016-04-15
• Deforestation, e.g. — 2014-06-13
• Chemical dumping, e.g. — 2006-07-22
• Environmental disaster — 2003-05-09
• Greenpeace concern — 2001-12-14