The WHO has classified diesel exhaust as a Class 1 carcinogen, alongside cigarette smoke and asbestos. Image by SpecialKRB via Flickr.
A study by Columbia University found that even the least expensive white roof coating can reduce peak rooftop temperatures in summer by an average of 43°F. Photo by 350.org.
New Delhi's Kalka Mail train derailed on Sunday, killing more than 60 passengers. Photo by Jag Pee.
Jakarta's city government is consulting Istanbul's city government for advice on managing traffic congestion for its bus rapid transit system. Photo by nSeika.