Living on Earth: April 27, 2012

Citrus Disease Threatens California Fruit Growers / New FDA Guidelines for Nano Particles / Food Deserts: A Mirage or Reality? / Scotland's Wind Farms Have Environmental Drawbacks / BirdNote® Limpkin, Bird of the Swamp / The Art of American Cartography Learn more about your ad choices. Visit megaphone.fm/adchoices