The Nature Conservancy is a conservation organization that works to protect ecologically important lands and water. 

This organization focuses on fostering the science and art of sustainable soil, water, and related natural resource management.

The mission of this nonprofit consortium of scientists, planners, administrators, ecological consultants, landscape architects, engineers, and others is to promote ecological restoration as a means of sustaining the diversity of life and to reestablish an ecologically healthy relationship between nature and culture. 

NANPS is a nonprofit association dedicated to the study, conservation, cultivation, and restoration of native plants. Its website contains links to state and local associations. 

This quarterly print and online publication from the University of Wisconsin-Madison Arboretum provides a forum for people interested in all aspects of ecological restoration. 

This website provides links to local information on invasive species, provides an overview of the problem and regulations associated with invasive species, and provides information on grants and funding opportunities. 

This organization can help with the purchase of conservation easements. 

This nonprofit industry association consists of individuals and public and private organizations committed to developing a market for green roof infrastructure products and services across North America. 

This is an online forum of discussion for energy efficiency, computer model software users.

International association of energy modelers with various national and local chapters.