Do you think about the energy your computer puts out? A New York Times story unpacks a list of ideas for using–and buying–an energy efficient PC (or Mac). After all, the machine that can provide you with information on how to lead an ecologically sound life can also be contributing to the environmental problem you are trying to solve. The story suggests turning your PC off at night, ditching the screensaver and downloading a power-management tool. Also, when buying, check to make sure the model is Energy Star compliant.