Well okay, the real reason is that I realize that the last episode I did just lacked that Captain Planet spirit to it. Oh, sure, it had deforestation (Ted Turner's favorite thing to cry about) and some jerkoff who loves the dying coughs of all the animals he runs over with his giant bulldozer of evil, but mostly it was about Skumm and his sick little rat fetish than anything pollution-themed.
I think the main problem was that it had Verminous Skumm. Sir Skumm always got the short end of the stick when it came to episodes. It's like the writers knew that crime and disease are in that grey area of "Is it really an environmental issue?" so he ended up getting weird episodes like an episode where he steals an artifact from a museum (because the theft of archaeological finds is exactly what I picture when I think Captain Planet) or that really embarrassing AIDS episode where Skumm is kind of a dick to this one HIV-positive kid for no reason.
So just to be fair, I'm covering a Captain Planet that's more in your face with its environmentalism. For starters, this episode has Dr. Blight in it, and man does she love the smell and feel of freshly cut wood from a rare, endangered forest. She's also voiced by Meg Ryan, which means that there are gentlemen (and the occasional lady, I won't discriminate) who watched this episode and now have the deep, penetrating shame that is being turned on by a Captain Planet cartoon.
Should you decide to stick around, this is the episode that James Cameron watched and decided "Hey, you know what this needs? Cat people from outer space!". This is...
Tree of Life