| iea.org | International Energy Agency: Environment |
| cleanerandgreener.org | Cleaner and Greener Environment Program |
| millenniumenergyinc.com | Millennium Energy Inc |
| epa.gov | EPA Clean Energy Site |
| environmental-expert.com | Environmental-Expert.com |
| ca.gov | Avian Collision and Electrocution: An Annotated Bibliography |
| 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 |
| bnl.gov | National Photovoltaic Environmental, Health and Safety Assistance Center |
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