At nearly three times the size of the Pentagon, Chengdu's New Century Global Center has staked a claim to the title of world's largest building. How do you keep 420 acres of floor space lit? Build an artificial sun, of course.
When thinking about the right way to invest in renewable energy, it's important to realize the different land use impacts of solar, wind, biofuels, along with coal and nuclear, says Clinton Andrews of Rutgers University.
The U.S. Military's Defense Advanced Research Projects Agency is investing in a program that looks to create 3D imagery of urban areas and the common spaces and objects that could pose threats or provide advantages to military operations.