Kabul

With the latest round of global climate change talks set to begin this week in Cancun, Mexico, the assembled delegates should be thankful they're not meeting in, say, Beijing or New Delhi. Those two cities are tied at the top of a list no city should want to be on: those with the world's most dangerous air.

As the conflict in Afghanistan drags on, the U.S. has announced that the troubled Asian nation is sitting on upwards of $1 trillion in untapped mineral deposits. However, the resources are likely to end up getting mined not by American but by Russian and Chinese firms.