| Growth
in Membership of Environmental Organizations |
|
| Group |
before 1962 |
1970 |
1980 |
1991 |
| Audubon Society
(1962) |
41,000 |
81,500 |
400,000 |
600,000 |
| Izaak Walton League
(1966) |
52,000 |
53,600 |
52,000 |
50,000 |
| National Wildlife
Federation (1966) |
271,000 |
540,000 |
818,000 |
5.6 million |
| Sierra Club (1959) |
20,000 |
113,000 |
165,000 |
650,000 |
| Wilderness Society
(1962) |
27,000 |
54,000 |
50,000 |
350,000 |
| Environmental Defense
Fund |
|
|
|
150,000 |
| Natural Resources
Defense Council |
|
|
|
170,000 |
|
| Total of Group of 10 |
. |
. |
. |
7,790,000 |
| Source: Sale, Kirkpatrick.
1993. The Green Revolution - The American Environmental Movement 1962-1992.
Hill and Wang, New York, 124 pp. |