Want to make a real difference when you wash your clothes?
Buy the cold water detergent, and wash your whites in cold water. You will save energy and money, and reduce greenhouse gas emissions at the same time.
Also, use half of the recommended amount of detergent. You will reduce the amount of surfactants that are put into the environment (they harm the gills of fish.) And you will save yourself even more money!
I guarantee your clothes will still come out clean.