This month a bunch of us at work are participating in a "Green Coffee" challenge; it started with Katie, and now it's official. For the month of November, we're not allowed to drink coffee from a paper cup. Every time you break the commitment, you have to put a dollar in the jar (see left), and at the end of the month we'll donate all of the money to the Million Trees NYC program, which aims to plant one million trees in the city. We also have a Facebook group, which is by invitiation only. If you want to join the challenge, and you're willing to donate a dollar to a good cause every time you grab a paper cup, then leave a message below.