Green Engineering

Penn State Center for Sustainability
World Wide Web Virtual Library  - large list of web sites to a number of resources in all areas of sustainable development
Alternative Fuels Data Center
Consortium Green Design and Manufacturing   A good overall site from the University of California - Berkeley.
Cornell Center for the Environment
DOE Energy Efficiency & Renewable Energy Network
DOE Sustainable Design
EnviroLink
EPA Green Engineering Program
Green Business Network
Green Design Initiative  from Carnegie Mellon University.
National Environmental Data Index
Smart Communities Network
Oak Ridge National Laboratory, Energy Efficiency &  Renewable Energy Program
GNET: Global Environment and Technology
Greenbuilder: Sustainable Building Resource
Second Nature site to "help colleges and universities make environmental sustainability a 'foundation fof learning and practice.'"
Sustainable Development from the Internet Public Library
Sustainable Systems Research Center (RIT)
WFEO (World Federation of Engineering Organisation site for sustainable development

ACEEE's Green Book Online: The Environmental Guide to Cars and Trucks
Alternative Fuel News
Electronic Green Journal
Clean Cities Now