Thinking Ahead: Protecting the Environment in the 21st Century
نویسندگان
چکیده
The United States has made notable progress in cleaning up the environment over the last 30 years. Our nation's air, land and water are, in almost all cases, significantly cleaner than they were only a few decades ago.' Before declaring victory though, we must acknowledge that some environmental problems are getting worse, and the nature of our environmental problems has changed. Many environmental problems are now global problems, as opposed to problems that could be dealt with at the national or state level. Problems have become diffuse, with no clearly identifiable source and with a lengthy delay between cause and effect, whereas before problems were immediately obvious with distinct sources. Finally, environmental problems have become very complex, changing from the relatively simple problems such as thinning eggshells due to pesticide abuse .
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