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Aug 18, 2015 05:48 PM ET // Patrick J. Kiger
The sun triggers the release of smog-forming nitrogen oxide compounds from urban grime. Continue reading →
Aug 12, 2015 06:07 PM ET // AFP
A massive explosion at a warehouse in the northern Chinese port city of Tianjin killed seven people and sent a fireball ripping through the sky. Continue reading →
May 14, 2015 01:01 PM ET
Right now, there are 28 mega-cities in the world, with about 450 million inhabitants among them. So, which world cities make the cut?
Apr 30, 2015 08:18 AM ET // Patrick J. Kiger
An international team of researchers has figured out which cities squander the most resources, and which are the most efficient.
Feb 20, 2015 05:59 PM ET // Patrick J. Kiger
Pollution and the urban heat island effect may cause slightly more thunder and lightning than rural areas get. Continue reading →
Jun 9, 2014 06:17 PM ET // Patrick J. Kiger
So much heat is emitted by air conditioning units in Phoenix it actually raises the city's outdoor temperature at night. Continue reading →
Jun 7, 2014 12:10 PM ET // Patrick J. Kiger
The Chines government is removing the tops of 700 mountains to create 155 square miles of free space to build cities. Continue reading →
Oct 1, 2013 09:40 AM ET // Tim Wall
Expanding cities can swallow biodiversity hotspots and other important protected natural areas.
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