In the 1800’s, a man named Harry Curtiss Mills started a collection. The Connecticut resident amassed and traded thousands of bird eggs, from 840 species. His egg collection was donated to a local library where for decades it was neglected, stored away in a cabinet. Now, Harry Curtiss Mill’s eggs have found a new home in the University of Connecticut’s Biodiversity Research Collections. As producer Laurie Sanders reports, the egg collection provides a unique record of bird life in 19th century Connecticut.

Copenhagen will soon be using a very cool technology to ensure there's nothing rotting in Denmark. The first phase of its new district cooling system will soon be up, running and cooling the capital city. Living on Earth's Bruce Gellerman takes a tour and learns that not only will it dramatically cut CO2 emissions and energy...at times, it'll even be free.

Not much is known about the walrus since the animals inhabit some of Earth’s most remote places. But researchers are beginning to observe some remarkable things about walrus behavior: not only are they very musical, but they are also very gregarious and sexual. Matthew Brunwasser reports.

American soldiers returning from war often struggle to readjust to civilian life. Today, many veterans are turning to environmental work and activism to make the transition. Host Jeff Young talks with veterans working for clean energy, creating green jobs, and healing their own wounds by restoring habitats.

Researchers discover that maple trees generate tiny, detectable amounts of electricity. Nirja Parekh reports on tree power’s potential as low-cost, green technology.

Living on Earth continues its series with readings from the book “Home Ground: Language for an American Landscape,” edited by Barry Lopez and Debra Gwartney. In this installment, poet Pattiann Rogers defines “kudzu.”

The EPA recently announced a list of chemicals to be reviewed. On the list: flame retardants or PBDEs. Scientists say these chemicals, used to reduce the flammability of upholstery and carpeting, accumulate in our bodies. Host Jeff Young talks with Dr. Julie Herbstman of Columbia University about a new study that indicates PBDEs may affect the intelligence of young children.