This Is Why We Generally Turn Humans Aquatic...
The answer is to turn humans piscatorial so they can, quite literally, SWIM AWAY FROM ALL THIS NONSENSE. The doofusy t-shirts will biodegrade, or our Rat sisters will process them into bedding. Ladyslippers and ferns will grow up through the chassis of every abandoned internal-combustion vehicle. Their cultivated fields will go back to forest. And the rivers, lakes and seas will be filled with FISH who do not miss being ridiculous NAKED APES.