Earth Matters

San Francisco starts mandatory composting this week

EnergyStar appliances don't all measure up

Will pollution help space aliens make contact?

Video: Bay area marks anniversary of 1989 quake

Media Mayhem: Nuking climate change

Alexandra Cousteau wants you to run for clean water awareness

MNN week in review 10/17/2009

Australian dust storms

The 15 most toxic places to live

NASA photos: The Hubble is back

10 remarkable animals that have saved lives

10 bugs that will make you squirm