People around the world rely on groundwater as a safe drinking source. But, as University of Wisconsin hydrogeologist Jean Bahr notes, groundwater can sometimes contain toxic substances — like arsenic.

Listen Now:

Marcus Eriksen of the Algalita Marine Research Foundation describes an enormous floating soup of plastic garbage in the north Pacific — and the impact it could have on humans.

Listen Now:

“What they?ve done here is drawn this connection between CO2 and climate change and the changes to temperature, and the effects that will have on conventional air pollutants and therefore on public health,” said Dan Greenbaum of the Health Effects Institute. Hear more from Greenbaum …

Listen Now:

Listen to Jerry Melillo, an ecologist at the Marine Biological Laboratory in Woods Hole Massachusetts. He and his colleagues are working to document climate change impacts already occurring in the U.S.

Listen Now:

Listen to Charles Rice talk about the complex relationship between soil and our warming world.

Listen Now:

Climate scientist Ken Caldeira told EarthSky that we might have already failed at cutting emissions in time to prevent a climate crisis. He?s a proponent of conducting scientific research to find ways to turn down the global thermostat through technology.

Listen Now:

Climate scientist Stephen Schneider of Stanford spoke about avoidable and unavoidable climate impacts.

Listen Now:

Martin Dym conducts research on adult stem cells at Georgetown University. He said modified adult cells might become an effective alternative to stem cells taken from human embryos.

Listen Now:

April 21, 2009. The Lyrid meteor shower will peak late night tonight until dawn tomorrow. No matter where you live worldwide, the most Lyrid meteors are expected to fly during the dark hour before dawn.

Listen Now: