As far as eco-friendliness is concerned, man's best friend is way ahead of humankind. Think about it: Nobody's more earth-friendly than dogs. The big grassy fields they love to play in, the rich dark earth they love to dig in, the neighbor's front lawn they love to organically fertilize... We all love planet Earth, but dogs really love it. Which is why it's sad that so much doggie business ends up in landfills in those plastic pooper-scooper bags. So take this ingenious invention with you next time you take the pooch for a walk: dog business bags made of corn that completely biodegrade in 45 days. As much as your dog loves marking his territory -- in the only way he knows how -- even he would have to admit he doesn't need his territory marked until the year 2500. $5.95 for 40 at PlanetDog.com.