Do you still send out printed cards for the holidays? Instead of buying them from a store, why not support environmental charities at the same time? Environmental, humane and humanitarian organizations like the National Wildlife Federation, the Humane Society of the United States and UNICEF all sell printed cards through their online shops. A portion of the sale goes to benefit the charity's work, and your card will also contain advocacy messaging that you can send to your recipient. It's an easy way to support good causes and get lovely printed cards, too.