"Human population will not be allowed to grow [indefinitely]. Even small growth rates will step up pressure on natural resources, and Earth can only support so much, long-term. Independent of what the “right” number is, once settled, we will not be able to dial it up without imperiling the hard-won success. Even under steady human population, any increase in resource use per person will also not be compatible. In general, growth leads to a dead end: to failure."