Every trip to Antarctica inspires awe and concern for the fragile frozen continent. But every trip also contributes to the global warming that's eating away at the place. So is it better to visit Antarctica, or stay away?
Negotiators have agreed to a global phase-out of chemicals that run some air conditioners and refrigerators, but are also big contributors to global warming. That has countries and researchers scrambling to come up with clean and affordable alternatives.
There may be a counterintuitive explanation for the deep freeze that hit New England this winter: The rapidly warming Arctic is causing big disruptions in the jet stream, which carries weather across North America. Is this the worst winter you've experienced?
Unhappy with the economics of his rooftop solar panels, a German tinkerer invents his own electricity storage system that saves users hundres of dollars a year, makes it easier to integrate renewables into the grid, and wins an award for renewable product of the year.