Is there a greener way to get rid of your Christmas tree than throwing it in a dumpster? Of course!
Many cities send trucks out to pick up Christmas trees over the couple weeks after Christmas. Most local papers list the schedule. Call your local recycling center if you can't find one. Also, a great site to visit is Earth 911, where they will help you locate a tree recycling center nearby.
Christmas trees make great mulch with a refreshing scent. Many trees end up as mulch on trails at local parks.