Rivers of Oil

5: The decision

The Line 3 project has gotten approval from Minnesota regulators. But the fight over this oil pipeline is far from over.

4: The rallying cry

In the early 2000s, the Keystone XL oil pipeline became one of the most powerful symbols in the fight against climate change. And since then, it's not just local landowners fighting pipelines in their backyards anymore. It's environmental groups, Native Americans tribes, farmers and ranchers, and a crucial addition to the alliance -- climate change activists. But how did it begin?

3: The spark that ignited fires

Pipelines have become a potent issue for Native American and indigenous people, who are fighting them across North America. Part of the fight is over culture and identity. But it also involves a messy history of land and treaties, and a long, complicated relationship with the U.S. government.

2: The largest inland spill

This story isn't just about the risks of transporting huge amounts of oil through pipelines. It's also about the reward that oil provides.

1: Pipes

Pipelines are everywhere: 2.5 million miles of them form a web under our feet, our rivers and our roads. They're at the forefront of an epic tug of war between our reliance on oil and the risk that oil poses to the future of our world.