Some environmentalist theory apparently. Maybe theory isnt the right word:
http://www.populararticles.com/article38933.htmlQuote:
You may have seen a news story about the London Zoo's exhibit of eight humans (three males and five females) within a habitat normally assigned to bears. The purpose of the exhibit, according to the zoo, is to present human beings as a "plague species" and to show our place in the world's ecosystem.
"Plague species" is a phrase out of the radical environmentalist movement. It suggests that human beings provide no benefit to the world but, like parasites, survive by causing harm to their neighbor species. Environmentalists point out that Homo sapiens has destroyed 844 other species and some 800 million of its own kind, and they claim that human activity endangers the extinction of thousands of other species. In fact, the title of a 2003 book by Reg Morrison asks, Plague Species: Is it in our genes?
More at the link.