Dietz T, Rosa E A
Department of Sociology and Anthropology, George Mason University, Fairfax, VA 22030, USA.
Proc Natl Acad Sci U S A. 1997 Jan 7;94(1):175-9. doi: 10.1073/pnas.94.1.175.
We developed a stochastic version of the Impact = Population x Affluence x Technology (IPAT) model to estimate the effects of population, affluence, and technology on national CO2 emissions. Our results suggest that, for population, there are diseconomies of scale for the largest nations that are not consistent with the assumption of direct proportionality (log-linear effects) common to most previous research. In contrast, the effects of affluence on CO2 emissions appear to reach a maximum at about $10,000 in per- capita gross domestic product and to decline at higher levels of affluence. These results confirm the general value of the IPAT model as a starting point for understanding the anthropogenic driving forces of global change and suggest that population and economic growth anticipated over the next decade will exacerbate greenhouse gas emissions.
我们开发了一种随机版本的“影响=人口×富裕程度×技术”(IPAT)模型,以估算人口、富裕程度和技术对各国二氧化碳排放的影响。我们的结果表明,就人口而言,最大的国家存在规模不经济,这与大多数先前研究中常见的直接比例关系(对数线性效应)假设不一致。相比之下,富裕程度对二氧化碳排放的影响似乎在人均国内生产总值约为10,000美元时达到最大值,并在更高的富裕程度水平上下降。这些结果证实了IPAT模型作为理解全球变化人为驱动力起点的一般价值,并表明未来十年预期的人口和经济增长将加剧温室气体排放。