More than three-quarters of U.S. wells make just 6% of the country's oil. They're called marginal wells because of their small output. But they're a big deal to oil producers and environmentalists.

(Image credit: September Dawn Bottoms for NPR)

As a trade war grew this week, Ontario's leader threatened a surcharge on Canadian electricity sold in some U.S. states. The episode highlighted the U.S. reliance on imported Canadian power.

(Image credit: Joe Raedle)

Batteries are everywhere. They're in our phones, our remote controls, smart-watches, electric cars and so much more. They could also be the solution to a problem that renewable energy companies have faced for years: How to store the mass amounts of energy they produce for later use. Some companies are using batteries to make renewable energy accessible 24/7. Today, we dig into how the technology is rapidly progressing with Cooper Katz McKim, a producer from fellow NPR podcast The Indicator from Planet Money.

Listen to The Indicator's three-part battery series.

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President Trump's calls for the U.S. to take over Greenland have sparked alarm and outrage.

Denmark, which is responsible for Greenland's security, recently announced that it would further boost its defense spending.

And a recent poll found 85 percent of Greenlanders are opposed to being part of the United States.

Parliamentary candidate Naaja Nathanielsen is one of them.

It isn't clear whether Trump's ambitions for Greenland will take. But some politicians in the territory are taking his calls for acquisition more seriously than ever before.

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Panama has been looking for solutions to a long-term problem. Every time a ship passes through the Panama Canal, more than 50 million gallons of fresh water from Lake Gatun pour out into the ocean.

Nobody ever thought Panama could run out of water. It is one of the rainiest countries in the world. But a couple years ago, a drought got so bad that the canal had to reduce traffic by more than a third - which had a huge impact on global shipping.

The Panama Canal needs more water. Authorities have decided to get it by building a dam in a spot that would displace more than 2,000 people along the Rio Indio.

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(Image credit: Tomas Ayuso)

9 out of ten cars sold in Norway are EV's. Government incentives and a commitment to charging stations have made Norway a world leader in electric vehicle use.

(Image credit: Bloomberg)

Syria's new de facto government faces a host of challenges. One of its most pressing is also one of its most basic: keeping the lights on.

(Image credit: Ayman Oghanna for NPR)