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THis book was useful for comparing the impacts of different choices.

 From The Consumer's Guide to Effective Environmental Choices:  
Practical Advice from the Union of Concerned Scientists

 From page 85:
*PRIORITY ACTIONS FOR AMERICAN CONSUMERS:
Transportation:
Choose a place to live that reduces the need to drive.
Think twice before purchasing another car.
Choose a fuel efficient, low polluting car.
Set concrete goals for reducing your travel.
Whenever practical, walk, bicycle, or take public transportation.
Food:
Eat less meat.
Buy certified organic produce.
Household Operations:
Choose your home carefully.
Reduce the environmental costs of heating and hot water.
Install efficient lighting and appliances.
Choose an electricity supplier offering renewable energy.

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