Colorado Natural Areas Program - Information on Colorado native plant communities, geologic formations, paleontological localities and habitat for rare plants or animals. Also: native plant revegetation guide, wetlands best management practices, and research grant information.

The Nature Conservancy of Colorado - A nonprofit conservation organization dedicated to preserving biodiversity by protecting habitat for species of plants, animals and natural communities.

Sierra Club Rocky Mountain Chapter - Colorado chapter of the environmentalist organization.

Dolores Water Conservancy District - Located in the Dolores and San Juan river basins in southwestern Colorado, is developing water from the Dolores River for:irrigation, municipal and industrial users, recreation, fish and wildlife, hydroelectric power.

Colorado Wild - Coalition working to halt environmentally damaging ski area expansions, logging, and out-of-control motorized recreation to protect wildlife in the forests of Colorado.

Colorado Environmental Coalition - The citizens' voice for Colorado's environment since 1965.

Western Colorado Congress - Grassroots, democratic group organizing people to increase their power on issues of environmental stewardship, sustainable communities and economic justice.

Colorado State University Cooperative Extension - Information for consumers about crops, farm management, food and nutrition, gardening, insects, livestock, resources and youth development across the state.

BASIN - The Boulder Area Sustainability Information Network - Extensive source of information, including real-time monitoring data, on water resources and other environmental conditions in and around Boulder, Colorado.