Adding another 2.5 billion people to the planet will put enormous strains not only on societies with rising populations, but on the entire planet. Total energy use is soaring, reflecting the combined effect of rising per capita incomes - and thus rising per capita energy use - and population growth.
增加25亿人口，将不仅使社会承受巨大压力，而且整个地球都会过度疲劳。能源使用的高涨正反映了人均收入提高--引发人均能源使用的提高--以及人口增长的综合影响。