Because I have a big recycling bin behind mi casa, I honestly put recyclable trash such as aluminum cans, papers, magazines, manila envelopes and cardboard. Therefore I know that I am at least helping the environment. And because I am into the environment today...check this tee:

It is from XXI mens, but not sure if they are available for women. But yeah "Don't Be Trashy..."
OR
If you are a fan of U2 or specially Bono, you can get this shirt and know that you are really making a difference...
from their website: "EDUN is a socially concious clothing company launched in Spring 2005 by Ali Hewson and Bono. The company's mission is to create beautiful clothing while fostering sustainable employment in developing areas of the world, particularly Africa."
They partnered with ONE organization which helps Lesotho, Africa give medical treatments to people suffering from AIDS.
so breathe in...1...2...3 (hold it) breathe out.... smile because you are helping ze wold.