A large part of the public truly believes that climate activist groups are comparable to David fighting Goliath (read: industrial manufacturers operating worldwide). Such views are mistaken. In the article Cracking Big Green: To Save the World from the Save-The-Earth Money Machine (2018), authors Ron Arnold and Paul Driessen have used information from the annual reports of non-profit organisations.

The Sierra Club: $97,757,678
The Sierra Club Foundation: $47,163,599
The Environmental Defense Fund: $111,915,138
Natural Resources Defense Council: $98,701,707
National Audubon Society: $96,206,883
National Wildlife Federation: $84,726,518
Greenpeace USA: $32,791,149
National Parks Conservation Association: $25,782,975
The Wilderness Society: $24,862,909
Al Gore’s Alliance for Climate Protection: $19,150,215

These are only organisations with average incomes. The larger figures are as follows:
The Nature Conservancy: $949,132,306 (yes, close to $1 billion)
Greenpeace International: $406,000,000
Wildlife Conservation Society: $230,042,654
World Wildlife Fund: $208,495,555