"If enough species are extinguished, will the ecosystems collapse, and will the extinction of most other species follow soon afterward? The only answer anyone can give is: possibly. By the time we find out, however, it might be too late. One planet, one experiment."

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Men in America were terrified that if women got an equal say in society, the system would collapse and their lives would be valued less. Whites in America were scared that if blacks obtained their freedom and equality, the system would collapse and their lives would be devalued. Heterosexuals are terrified that the psychotic institution of marriage will collapse if gays are given their right to marry. And humans are terrified that if animals are liberated and no longer viewed as inferior subordinates, human life will be valued less.

— Gary Yourofsky