Quick Idea: Sometime a simple change is also a big change.
Check out Danni Brancaccio’s blog about her quest to go all summer on one tank of gas, simply by changing her habits.  Granted, she sometimes borrows her mom’s car (per CNN).
Resources
Simple Human 101 ways to use less gas
Freakonomics on The New York Times Hurray For [...]

Quick Idea: Tossing your table scraps from CNN.

I’m trying it in Cambridge… It’s pretty cool & I feel good about doing it.  The only downside is the swarm of fruit flies uder the kitchen sink.  ick.