It takes a lot of water and wood to produce one sheet of paper. We often use less than 5 minutes the paper produced at high environmental cost. A circle card, on the other hand, can be used for years. It’s especially cool when the card comes back to you in a circle. The idea is that you make a double-sided card. You write your greetings on an extra sheet of paper and send the card to a friend. The following year, your friend exchanges the extra sheet and sends the card with the new sheet back to you or to your friend. And that’s how the card circulates, and how many buckets of water and trees are saved!