Greenhouse gas trading is now a multibillion-dollar international business and is expected to continue to grow, despite uncertainty about a post-2012 international climate regime.

The Obama administration sees the Organization of the Islamic Conference as a venue through which to court Muslims globally, but the group’s controversial positions on some issues could pose problems.

The countries outside of the Nuclear Nonproliferation Treaty--North Korea, Pakistan, India, and Israel--present a significant challenge for U.S. diplomacy and efforts to restrain the spread of nuclea…

The Review Conference of the Nuclear Nonproliferation Treaty gets underway amid new concerns about Iran and North Korea and disputes between nuclear haves and have-nots. Fifteen countries will play a…

The UN conference on climate change that begins December 7 in Copenhagen is supposed to produce new targets for emissions reductions, but experts say major countries are at odds on the ultimate goal …