1.全球性生态危机的各个方面20世纪后期迅速激化的环境问题有一个共同的特点:越来越具有全球性。以往人类经济活动的生态影响总的来说是有限的和地方性的,但如今世界农业和工业生产规模已如此庞大,以致整个全球生态体系都受到 1. All aspects of a global ecological crisis The rapidly escalating environmental problems of the late twentieth century have one common characteristic: more and more global. In the past, the ecological impact of human economic activities was generally limited and endemic. However, the scale of the world’s agricultural and industrial production has so far been such that the entire global ecological system is affected