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After years of study, Rocky Mountain National Park has become the first national park to establish a "critical load" for pollution. The load represents the limit beyond which pollutants cause harm to wildlife and plants. The nitrogen levels in the park are already more than twice the critical load.

Parts of the Florida Keys are being overrun by green iguanas. Many are escaped or abandoned pets. They nibble foliage and are a nuisance on the roads. Kim Gabel, a county extension agent, sizes up the situation for Jacki Lyden.

Many high school programs encourage students to volunteer in their community, reaching out beyond their classrooms. But NPR's Nancy Solomon reports that some experts worry the programs are sending an incomplete message about citizenship.

A Missouri radio station is airing Russian state-funded broadcasts. In a rare move, the National Association of Broadcasters called for stations to cease airing state-sponsored programming.

All seven of North Carolina’s recent measles cases are in Western North Carolina, including two newly confirmed infections in Buncombe County at a school with low vaccination rate.

UNRWA is accusing Israel of breaking international law for demolishing UN buildings in East Jerusalem. Undeterred, Israeli officials say they want to shut down more UNRWA facilities.

Navy Yeoman Jacob Tate remembers his time as a gay serviceman during the "Don't Ask Don't Tell" era, which kept openly LGBTQ service members from serving in the military.

Scott Simon talks with New School Economics Professor Darrick Hamilton about the long-standing racial disparities in the unemployment figures.

Melissa Block talks with Ambassador Ryan Crocker — dean and executive professor at the George Bush School of Government & Public Service at Texas A&M University — about military options for Syria. From 1990-2012, Crock was ambassador to Afghanistan, Iraq, Pakistan, Syria and Lebanon.

NPR's Ari Shapiro talks with Outside Magazine writer Kathryn Miles about her article on people who died while taking smartphone photos of themselves.