Natural species are the library from which genetic engineers can work. Genetic engineers don't make new genes, they rearrange existing ones. Speaking as World Wildlife Fund Executive Vice President, stating the need to conserve biodiversity, even plants and animals having no immediate use, as a unique repository of genes for possible future biogengineering applications.
At least when somebody's suffocating, you can tell: you see their faces turn blue, their lips quiver, their eyes buck, and their throats jerk. But when a man is mentally packing his bags the suitcase is never out until he's already standing on the other side of the door.