The pope’s encyclical on the environment carries a profoundly religious message about care for the earth, wedded to a new call for activism, say religious scholars Mary Evelyn Tucker and John Grim.

The 2001 law that authorized the U.S. war against al-Qaeda and its affiliates is not an appropriate justification for the offensive against ISIS and other emerging terrorist groups, says CFR’s John B…

Paul Collier, an economist and author of The Bottom Billion, discusses five steps to sustainable resource management in Africa.

A leading Republican candidate for president, Sen. John McCain, tells CFR.org the country needs to unite over issues ranging from Iraq to immigration.

A CFR expert on nuclear issues, Paul Lettow says President Obama’s agenda will be heavily tilted toward nuclear issues in 2010. He says this is "the ideal moment for strong American leadership on the…