Ravens vs Dolphins coverage begins Thursday at 7 p.m. | Ravens Lose To Vikings 24-16 | VOTE: Ravens Play Of The WeekSee The Gallery
Breathing Easier? Satellites Show The Air Down Here On Earth Is Cleaner Than It Used To BeIt's not just space NASA focuses on. A fleet of satellites also studies the Earth. That vantage point is showing most of us are breathing cleaner air.
Auto Emissions Fell 20% In 5 YearsAmerica's CO2 emissions may have reached a 20-year low. But why?

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