Charging for plastic bags changes behavior

Even as someone that really dislikes plastic bags, I very often forget to utilize the many reusable bags I have available to me, and end up with plastic bags from the stores where I do business.  What would it take to change my behavior and the behavior of others?  Simply adding a charge of a few cents for the purchase of bags can do it!  Read more about this in the Washington Post's Wonkblog, The surprising reason why those 5 cent charges for plastic gags actually work.