This holiday season, the Pacific Northwest Christmas Tree Association will be celebrating the family tradition and environmental benefits of a real Christmas tree by giving away Christmas trees to four of their lucky Twitter followers. To be eligible to win a real Christmas tree (via a $40 gift card), just follow the Pacific Northwest Christmas Tree Association on Twitter: @getrealtrees. Followers will be instructed to retweet posts for a chance to win a real tree. For full contest rules visit: http://twitpic.com/rmzhk

Some of the environmental benefits of purchasing a real Christmas tree are:

* Real Christmas trees are recyclable, sustainable and renewable

* Christmas trees are farmed like any other sustainable crop, such as produce or nuts.

* Real Christmas trees produce oxygen and reduce carbon emissions

* For each tree that is harvested, growers plant one to two more