In an effort to offset some of the holiday excess, why not mulch your Christmas tree? In NYC they call it mulchfest and set up wood chippers in various parks across the city. You bring your tree there and they turn it into mulch. I usually drag a few trees I run across on my way to the park as well. I find the sight of abandoned Christmas trees to be very sad, especially if they have tinsel on them. If you are in NYC, you can look here to find out when and where to bring your tree. It’s this coming weekend near me. If you don’t live in NYC, there seem to be programs all over the place. I would start by contacting your department of sanitation to see what they are doing.