Earth Matters

Top 6 tornado videos

Two reasons for more shark attacks

Findings: Hurricanes, water, soot

Generals, admirals say climate change a matter of national security

Video: Chris Matthews debates global warming denying politician

Video: Jon Stewart interviews EPA chief

The new frontier: Sustainable polar retreats

EPA Chief Lisa Jackson hits The Daily Show

Rep. Joe Barton introduces industry-serving dirty energy plan

San Francisco's solar initiatives paying off

Turbine plan received first permits

Media Mayhem: What’s in a name?