Crying wolf
The late Julian Simon made Ehrlich look like a dork, yet Ehrlich is still a respected voice in the environmental movement, and a winner of the MacArthur "genius" award. So it goes.
A Marvel Comics "no-prize" to anyone who can find a prediction by a well-known environmentalist twenty years ago that DID come true. No fair using easy ones like "the world population will be larger." We're looking for those wild-eyed, apocalyptic jobs.