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NPR political editor Domenico Montanaro joins Arun Rath to recap the latest developments with the 2016 presidential hopefuls.

A new project in L.A. is trying to make the city cooler by painting streets with a reflective coating to bounce away heat from the sun. Other cities like Phoenix are undertaking similar efforts.

A new project in Los Angeles is trying to cool the city by painting streets with a reflective coating to bounce away heat from the sun. Other cities like Phoenix are undertaking similar efforts.

In Southern California, a massive wildfire is burning through the Mojave Desert Preserve — threatening endangered Joshua trees. The cause of the York Fire is under investigation.

Wal-Mart wants to sell 100 million compact fluorescent light bulbs this year. The bulbs save energy and reduce emissions of the greenhouse gases that add to climate change. But there's a hitch: Each bulb contains about 5 milligrams of mercury, a toxic heavy metal. The EPA says they should be recycled.

Automakers are building more electric vehicles, but the EPA wants to set rules pushing them to go even faster. Environmental groups say that's essential; traditional carmakers say it's not feasible.

Voters in Fort Worth, Texas, and Detroit react to the second night of Democrats debating.

Researchers in upstate New York are working to rehome some tiny, rare snails. Understanding their decline could help mitigate broader climate changes.

More than 111 million people across the U.S. remain under weather advisories or warnings as forecasters say an oppressive heat wave might get worse before it gets any better.

Much of the U.S. continues to be gripped by extreme heat — especially Phoenix. That's where temperatures have been at or above 110 degrees every day for two weeks now.