Legend has it that hockey great Wayne Gretzky learned how to skate on an outdoor rink, just like millions of other Canadians. But climate change could make Canada's backyard rinks a thing of the past.
With the Ebola outbreak not yet behind us, global health workers are already scrambling to prevent what could be the next big outbreak of an emerging disease caused by a virus that jumped from animals into humans. In Tanzania, an organization is trying a new approach to tracking these new viruses and preventing another pandemic.
How do you balance the ebbs and flows of wind and solar power to use it when and where it's most needed? Turn it into hydrogen and use it to drive cars.
Too much renewable power? A German engineer comes up with a way to store excess renewable energy, take pressure off the grid and ease the way for the adoption of more wind and solar power in a country that's already way ahead of most of the rest of us.
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.
Sand is the building block of megacities around the globe. People use 40 billion tons of it a year. But it's finite. And like oil, controlling it is a deadly endeavor.
Not long ago, Egypt all but threatened war if Ethiopia built a huge dam it was planning on part of the Nile River. Now the two countries have signed breakthrough agreement to allow the dam to go ahead. It's a big deal in a region with a history of tension over scarce water resources
What do you do when all other efforts to persuade locals to protect endangered rhinos have failed? Pay them to harvest the rhinos' dung and use it to make paper. That's what an Indian startup company is trying, with early success.
Brazilians are notoriously lavish bathers, taking as many as three showers a day. But as the country faces a major drought, they're trying to find way to keep up the shower numbers while still saving water.
The unprecedented water crisis in South America's largest city is leading citizens to change everything, from how they use water to how they engage with politics. But while the government is taking action, residents say it's not nearly enough.