| epa.gov | EPA Clean Energy Site |
| scorecard.org | EDF Chemical Scorecard |
| iea.org | International Energy Agency: Environment |
| ca.gov | Avian Collision and Electrocution: An Annotated Bibliography |
| dieselnet.com | Dieselnet: Diesel Emissions Online |
| coalcombustion.com | Coal Combustion, Inc. |
| vcn.com | CoalBed Methane Coordination Coalition |
| ac.th | Asian Regional Research Programme in Energy, Environment and Climate, ARRPEEC |
| washington.edu | Energy and Environment at the University of Washington |
| upm.es | Environmental Software and Modelling Group, Technical University of Madrid |
| environmental-center.com | www.environmental-center.com/ |
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