Wow, I just found this great site, http://www.thegreenguide.com/, from National Geographic.  Categories include Summer Guide, Home & Garden, Personal Care, Kids, Health & Safety, Travel, Food, Go Local & Evo.  There are buying guides for things like: plastic containers (I needed this), sunscreen, beer, insect repellant, etc.

A section called Fast Facts will tell you "reducing your speed to 55 mph from 70 mph could increase your fuel efficiency by 23 percent."