interesting that Gallup in April 1999 found...
On the eve of the 30th annual celebration of Earth Day, a new Gallup poll finds that Americans have grown increasingly satisfied this decade with the nation's environmental protection efforts. A majority still sees room for improvement, but there is a growing perception that there has been progress in dealing with environmental problems and that society-particularly government and the public-expresses a sufficient amount of concern for the issue. Perhaps most striking, two-thirds of Americans today say they are generally satisfied with the state of environmental protection in the U.S., up from barely half who felt this positively six years ago.
Americans seem most concerned about the pollution of drinking water, with 68% worrying "a great deal" about this problem. Other big concerns to more than half the public include toxic waste contamination, pollution of rivers, lakes and reservoirs, and air pollution. Of the eleven issues tested this year, Americans are the least concerned about "acid rain," mentioned as a great concern by just 29%, followed by "global warming," at 34%.