DDT is a decent example... A major chemical insecticide that was used /everywhere/ in huge quantities, and was shown eventually to be terrible for all kinds of

DDT is a decent example... A major chemical insecticide that was used /everywhere/ in huge quantities, and was shown eventually to be terrible for all kinds of non-insect populations (like birds) with a tendency to linger in the environment for decades. These days we have a great many more choices of insecticides, and major declines in insect biomass and animal populations. Nailing down the culprit(s) is much harder because while there's a huge amount of spraying, there are far more chemicals to choose from. (The neonicotonoid family of insecticides seems like the best candidate, though: https://en.wikipedia.org/wiki/Neonicotinoid https://en.wikipedia.org/wiki/Neonicotinoid ) and, btw, here's the insect decline follow-up study: https://www.dw.com/en/munich-study-confirms-severe-decline-in-insect-populations-in-germany/a-51052955 https://www.dw.com/en/munich-study-confirms-severe-decline-i... 67% decline in ten years is TERRIFYING. Let's keep in mind that the SDG's include studying and preventing the potential impending collapse of the biosphere...