Americans invest a great deal of effort in monitoring and cultivating their physical, financial, and human capital. The environment and the ecosystem, on the other hand, are just beginning to receive attention. Over the last three decades, there has been a growing recognition that pollution poses a serious threat to human population and global ecosystems. One realization is that the ozone layer is weakening. In fact, estimates show that the ozone hole is as big …showed first 75 words of 3042 total…

…showed last 75 words of 3042 total…Edward. Environmental Science, Earth as a Living Planet: New York: John Wiley & Sons, Inc., 2nd ed. 1998: 484-490, 510-526. 2) Dowie, Mark. "A Sky Full of Holes, Why the Ozone Layer is Torn Worse then Ever" Annual Editions: Environment, Article 30 (1998): 230-234. 3) Http://www4.nas.edu/beyond/beyonddiscovery.nsf/web/ozone 4) http://sepp.org/ozone/ozone.html 5) Miller, Tyler Jr. Living In The Environment, 8th ed. New York, 1996: 301-310 6) "Ozone Layer," Microsoft® Encarta® Encyclopedia 99. 1993-1998 Microsoft Corporation.