I found this site today and thought that not only would I participate, but I'd pass this on to all of my readers too!  There is a group called Kaufda, based out of Germany, who is partnering with the Arbor Day Foundation, to plant one tree for every blog that does the following:

1. Write a blog post about the initiative and display the button on your sidebar.
2. Email the link of your post to CO2-neutral@kaufda.de
3. That's it!  One tree will be planted this spring in Plumas National Forest in Northern California.

I think this is an extremely easy way to help the environment and beautify the landscape at the same time!  Here is the link back to Kaufda's site so that you can choose which button you'd like to display on your own blog:

http://www.kaufda.de/umwelt/carbon-neutral/how-you-can-join/

If you participate in this project, please leave me a comment letting me know that you've done so!  I'd really like to see how many trees we can plant together!