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The countries share a border. Along the frontier, residents say a new barrier has disrupted everything from Arctic climate action and nuclear waste control to trade and cross-border sports leagues.

Four U.S. states are still struggling with high rates of lead poisoning from soil, pipes and paint. It impacts thousands of people each year, especially low-income communities and families of color.

With the climate warming rapidly, scientists are finding that cutting fossil fuels may not be enough. Carbon dioxide emissions may need to be vacuumed right out of the air.

A new tree-climbing institute in Oregon wants to increase awareness of old-growth forests by helping people explore treetop ecosystems. But the group wants to make sure the venture does less harm than good. NPR's Ketzel Levine reports.

The idea of "green" roofs -- covering the tops of buildings with plants, trees and grasses -- is as ancient as Mesopotamia. Touted as a solution to pollution and other environmental problems, they're increasingly showing up around the country. NPR's Ketzel Levine reports.

Baristas across the country are leading union drives at their workplaces. A combination of factors have led to this surge in activism among service workers who before now felt they had little voice.

The Corps, which built the levees and floodwalls that failed during Hurricane Katrina, is back to propose a new infrastructure project. It's not going over well.

A Hispanic community is demanding action from state regulators after enduring decades of pollution from a neighboring steel mill in Pueblo, Colorado.

Colombians elect the country's first leftist president and first Black woman to be vice president.

The city of Grenoble's move to allow the full body-covering swimsuit for Islamic women has sparked a legal battle. Activists say it's a matter of civil — and women's — rights.