What

Joseph Chamie, whom I interviewed early on here about the population

Without more of a focus on the implications of immigration policy for population, there could be 600 million Americans by 2100, he writes. Depending on whom you talk to, that is a boon or a disaster. Mr. Chamie notes that the relatively enormous thirst for energy, food and other resources from Americans, when compared with that of the average world citizen, gives outsize importance to issues like global warming and to American trends.

NY Times