The Charlotte mayor's nomination to lead the Department of Transportation hints at a renewed White House focus on boosting public transit and urban walkability.
The EPA and State Department have now clashed over the proposed pipeline twice in two years, muddling recent indications that its approval might be imminent.
In honor of the Earth Day season, NASA has released an awe-inspiring video of the best imagery captured by its Earth-observing satellites over the past year.
Three years after the worst oil spill in American history, the Gulf of Mexico is shifting from acute aftermath to the uncharted waters of long-term rehab.
The first graduating class of 'wildlife detector dogs' will soon be stationed at ports around the U.S., part of a growing effort to stem the illegal trade of flora and fauna.