And in order to achieve a sustainable economy and avert disaster, the United States would have to reduce its population by at least one-third, and world population would have to be reduced by two-thirds.
持続可能な経済を維持し、大災害を防ぐため、米国は少なくとも人口を3分の1減少させなければならず、世界人口も3分の2減少させなければならないと研究は述べている。