ExxonMobil, BP and the coal and natural gas companies—like the colonial buffalo hunters who left thousands of carcasses rotting in the sun after stripping away the hides, and in some cases carrying away only the tongues—will never impose rational limits on themselves. They will exploit, like the hustlers before them who eliminated the animals that sustained the native peoples of the Great Plains, until there is nothing left to exploit. Collective suicide is never factored into quarterly profit reports.