Biologists estimate 20,000 to 40,000 species go extinct every year, many times higher than the "background extinction rate" built into the evolutionary process. The cause? Human environmental impact, the product of consumption times population. Many environmentalists focus on our excessive consumption, but discussing the latter factor in the equation - population - has fallen out of vogue. Welcome to environmentalism's radical fringe: the Voluntary Human Extinction Movement and the Church... see more