The Millennium Book--Module 5: Environmental Challenges in the twenty-first century
by Ned Johnson
Since the 1970s, there has been an ever-increasing drum beat of alarm messages about our environment. Initially it was focused on ordinary features like litter, pollution, and smog. But as momentum grew it shifted in intensity and scope to include other areas, the majority of which few people had ever considered or even heard of. Now we had gone from smog to ozone depletion to global warming.