The iconic Mississippi River Delta is of enormous importance to the country, especially near the Gulf Coast. It's an economic engine and a key wildlife habitat. But it's shrinking considerably due to a variety of factors, including engineering done decades ago. Science Correspondent Miles O'Brien looks at those problems and efforts to prevent further loss. PBS News is supported by - https://www.pbs.org/newshour/about/funders

Many public health experts and scientists say they are stunned by Health Secretary Robert F. Kennedy Jr’s decision to cancel nearly half a billion dollars in federal funding for future vaccine development. MRNA technology was central in the battle against COVID and can be developed more quickly than traditional vaccines. Geoff Bennett discussed the implications with Dr. Michael Osterholm. PBS News is supported by - https://www.pbs.org/newshour/about/funders

The rise of artificial intelligence has sparked concerns across various sectors, including employment, education and national security. But one Kentucky county is taking a different approach, using the technology to boost something far more human: civic engagement. Judy Woodruff reports on an experiment that revealed surprising levels of agreement. It’s part of her series, America at a Crossroads. PBS News is supported by - https://www.pbs.org/newshour/about/funders

Imagine a future where the aging process can be delayed and more people live active, healthy and disease-free lives well into their 90s. That reality may be sooner than you think, according to Dr. Eric Topol, author of the new book “Super Agers: An Evidence-Based Approach to Longevity.” Ali Rogin speaks with Topol about the rapidly advancing science of healthy aging. PBS News is supported by - https://www.pbs.org/newshour/about/funders

It may sound like the stuff of sci-fi movies, but diverting food waste from the landfill and converting it into electricity has become a real thing. William Brangham visited Ben & Jerry’s Vermont ice cream factory and the operations next door to find out how it works. PBS News is supported by - https://www.pbs.org/newshour/about/funders

President Trump unveiled his approach to the development of AI. Surrounded by some of the biggest names in tech, he signed three executive orders. One targets what Trump called "ideological bias" in AI chatbots, another aims to make it easier to build massive AI data centers and the third encourages the export of American AI tech. Amna Nawaz discussed the implications with Will Oremus. PBS News is supported by - https://www.pbs.org/newshour/about/funders

The U.S. produces more plastic waste than any other country in the world. Last year, more than 35,000 tons of it was shipped to Malaysia, which received more discarded plastic from rich nations than any other developing country. But in June, Malaysian leaders effectively banned future shipments. John Yang speaks with Anja Brandon, director of plastics policy at Ocean Conservancy, to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders

According to a recent study published in the journal Nature Cities, 28 of the most populous U.S. cities are sinking. It’s due to a phenomenon called land subsidence, exacerbated in many cases by humans extracting too much groundwater from underground aquifers. Ali Rogin speaks with Grist senior writer Matt Simon to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders

The 2015 Paris agreement’s goal of limiting global warming to 1.5 degrees Celsius was thought to be the threshold for averting severe climate change impacts. But new research says even that level is too high to prevent the catastrophic consequences of sea level rise due to melting glaciers. John Yang speaks with Chris Stokes, one of the study’s authors, to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders

President Donald Trump went to Iowa on Thursday to start the countdown to the nation’s 250th Independence Day next year. To mark the anniversary, the nonpartisan Center for the Study of the Presidency and Congress is looking at 250 years of U.S. innovation. John Yang speaks with Glenn Nye, the center’s president and CEO, about the project. PBS News is supported by - https://www.pbs.org/newshour/about/funders