We have a population that's both growing and aging; we have seven billion souls today heading to 10 billion at the end of the century; we consume natural resources faster than they can be replenished; and the emissions that are mainly responsible for climate change just keep increasing.
世界人口正在不断增长和老龄化， 现在有 70 亿人， 到了21世纪末 将逼近100亿； 我们消耗天然资源的速度 快于它们能重新生成的速度； 而废气排放总在不断地增加， 这是造成气候变化的主要原因。