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.