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President Trump this week has been firing off letters to global leaders that threaten new, high tariff rates and also announcing them via social media. Here's what has happened so far.

There could be about a million 'orphan' oil and gas wells across the U.S. As they age, they can leak greenhouse gases or unhealthy chemicals.

The venture, privately funded to start, is now run by the University of Arizona. And today, scientists there are quietly plugging away at research they hope will help us all adapt to the Biosphere 1 — that is Earth, and the climate change we are causing to it.

As searchers continue to look for victims in the deadly flash flooding in Texas, officials are answering questions about the weather forecasts ahead of and during the storm.

Dozens of people have died and scores of others are unaccounted for in the Texas Hill Country following massive flash flooding. As the search for victims continues, questions mount about weather warnings.

The impact of severe heat waves on livestock is creating new challenges for those trying to manage the animals stress; alpaca farmers have surprising new methods.

A new report offers insights for U.K. efforts to improve areas with polluted water supplies.

At least 78 people are dead following flooding that slammed central Texas over the weekend, while a desperate search for 11 missing from a camp for girls continues.

NPR has compiled a timeline of when local, state and federal officials posted warnings on social media as well as the timeline of events as presented by local officials.

NPR's Pien Huang takes a journey to the Smithsonian Folklife Festival to hear from youth voices about how they're telling the story of America on the 4th of July.