On the Alaskan tundra, researchers are tracking the march of global warming. Science correspondent Miles O’Brien explores how soil composition and the sleep schedules of squirrels might offer data on the ways warmer temperatures are affecting ecosystems.
By PBS NewsHour
In southeastern Peru, where the Andes Mountains meet the Amazon, lies one of the world's richest ecosystems and the destructive lure of gold. In a collaboration with the Pulitzer Center on Crisis Reporting, special correspondent Steve Sapienza reports on illegal…
Science correspondent Miles O'Brien reports on the successful return of a once endangered species now caught in the crosshairs of cattle ranchers.
By Mike Fritz and Miles O'Brien
Five years ago, honeybees began dying in large numbers and hives were becoming defunct. Spencer Michels reports on the scientists who are still trying to figure out why this is happening and what can be done to help the problem.
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