It's not an obvious connection, but Wear Pact is offering to plant 20 trees through the Green Belt Movement, run by Lantern author Wangari Maathai, for every piece of underwear that you buy from their site. You can buy patterned or plain, and there are men's and women's styles. The underwear is "responsibly manufactured" in Turkey, and vegan. So, I just bought two pairs, and thought you might be interested in doing the same. What more is there to say?