Go watch Planet Earth (again, I hope), buy some energy efficient light bulbs to replace all the bad ones you probably have around your house, take a shorter shower than usual, only flush the toilet when it needs it, recycle, and start planting a garden.
That's your to-do list for today, let me know if you do any. I'll be proud.
PS: If that's not really your style, then go smoke a bowl in the woods and appreciate the beauty of nature :)