William Chandler, senior policy analyst for energy and climate at the Carnegie Endowment for International Peace, says that emissions-trading programs have achieved mixed results and should be readju…

William Luers, former U.S. envoy to Venezuela and Czechoslovakia, discusses his proposed multilateral nuclear-enrichment plan, which he believes could end the current Iranian nuclear crisis.

Teresita C. Schaffer, a former State Department official with extensive experience in South Asia, says the violence that has spread in Pakistan since President Pervez Musharraf ordered a crackdown on…

George Perkovich, a leading expert on Iran and nuclear nonproliferation issues, says there is no question that Iran has not complied yet with the IAEA investigation into its nuclear activities despit…