Came across this interesting post which speaks about the author's resolve to live a no impact life for a year in NY. By "no impact" he means not impacting the environment. A very daunting task indeed!
Even if he's not able to achieve "zero impact", he would at least substantially decrease his impact, that I'm sure. It would also motivate and inspire other people to take steps for the preservation of the environment. So all in all I think it's a good gesture towards the environment.
Related Links: Lighter Footsteps