It is deeply engrained within the movement, as this article from On the Square notes.
The root of it goes way back but lately rests with one of the thought leaders of the movement, Deep Ecology .
An excerpt from On the Square.
“David Attenborough—famous for hosting BBC’s The Living Planet and other nature documentaries—has recently drawn headlines for lambasting humans as a “plague on the Earth.”
“That someone of Attenborough’s stature (he has been knighted, among other official honors, and is so popular in the U.K. that he was named one the One-Hundred Greatest Britons in a 2002 BBC poll) would compare us to cholera evidences how mainstream anti-humanism has become within the environmental movement. Indeed, in the wake of the media firestorm about Attenborough’s remark, Population Matters—the U.K.’s largest population control trust, for which Attenborough serves as a patron—affirmed the analogy as “apt,” stating that we are indeed “like a plague of locusts, which consumes all it sees and then dies off.”
“This is nothing new for environmentalists. In 1972, the young David Suzuki told students: “One of the things I’ve gotten off on lately is that basically . . . we’re all fruit flies.” He likened us to “maggots” who are “born as an egg” and “eventually hatch out and start crawling around” eating and “defecating all over the environment.”
“One might forgive the excessive zeal of a young radical in a socially radical time for calling us embryonic flies. But given the opportunity in 2009 in a Canadian television interview to retract his insulting depiction of humanity, the now world-famous Suzuki demurred, lamenting merely that “Humanity is humanity. . . I just wish they’d stop being so human!”
“In recent years, deep misanthropy has seeped into the popular culture. For example, the 2008 remake of The Day the Earth Stood Still starred Keanu Reeves as Klaatu, an alien come to earth to commit total genocide to “save the earth.” At the end, he shows “mercy” by stripping us of our technology—an event which, were it actually to occur, would result in billions of human deaths. Illustrating how times have changed, the 1951 original version had Klaatu on earth to save humans, not wipe us out.”