Right now, there are 28 mega-cities in the world, with about 450 million inhabitants among them. So, which world cities make the cut?
An international team of researchers has figured out which cities squander the most resources, and which are the most efficient.
Pollution and the urban heat island effect may cause slightly more thunder and lightning than rural areas get. Continue reading →
So much heat is emitted by air conditioning units in Phoenix it actually raises the city's outdoor temperature at night. Continue reading →
The Chines government is removing the tops of 700 mountains to create 155 square miles of free space to build cities. Continue reading →
Expanding cities can swallow biodiversity hotspots and other important protected natural areas.
Experts say human influence has much to do with sinkholes.
During a 2003 heat wave, 4,867 people in Paris and nighttime temperatures were mostly to blame.