Scientific American Podcast: 60-Second Earth Folgen

How existing cities expand and new cities emerge will determine how humanity fares in the 21st century. David Biello reports  

Environmental destruction—from smuggling elephant tusks to illegal dumping of toxic waste—generates as much as $213 billion annually for criminals and terrorists. David Biello reports  

Computer models show that increased levels of greenhouse gases, along with their trapped heat, will make the atmosphere more stagnant, leading to many more days of unhealthy air. David Biello reports.