Photographer David Maisel has a knack for capturing the beauty and the horror of contaminated mines and toxic lakes.
There's "no excuse for the big man to always roll in an SUV," says the inventor of this eco-friendly holy tricycle.
It's about 100 times worse than listening to music without headphones.
The Midtown Greenway has been the site of many high-profile attacks on cyclists.
Real-life graffiti artists star in this fake 32-bit arcade game taking place in cities across North America.
Heavy agriculture and global warming are aligning to produce nasty algae blooms in the Great Lakes, scientists says.
Probably not, but that didn't stop one artist in Milan from standing outside the station slapping skin all day.
Artists in Madrid railed against the "destruction" of the Games with artwork made from what looks like Molotov cocktails.
Participants of the "International Sanitation Hackathon" have some promising ideas to fight disease and death caused by poor sanitation.
San Francisco just got a little less whimsical.
Sixty-four cities, 64 populations to rank by size.
Hitting urban rodents in their reproductive systems may be the best thing to ever happen to them.
This award-winning Dutch bike snaps together like one of those plastic airplane models that kids make.
Taking the bus makes people feel more social and less lonely, researchers say.
Rappers like to call out street names; New York artist Jay Shells likes to put their lyrics up at the actual intersections they mention.
The hotter neighborhoods of Raleigh are awash in scale insects, an ominous indicator of how bug populations might swell in a globally warmer world.
This latest gaping chasm is said to measure four-stories deep.
A modern dance from San Francisco.
This Ukranian urban climber is either extremely skilled or deranged (or perhaps both).