September 23, 2019 - PBS NewsHour full episode

Days after global protests calling for climate change action, the United Nations held a special climate summit where world leaders and other officials gathered to hammer out specific pledges to reduce greenhouse gas emissions. William Brangham joins Judy Woodruff to discuss whether action will come from the talks, the lack of U.S. leadership and activist Greta Thunberg’s fiery admonition.

After President Trump acknowledged that he spoke to Ukraine's president about investigating possible 2020 rival Joe Biden, he spent the day at the U.N. fending off questions about the potential abuse of power. Meanwhile, the administration's refusal to share a whistleblower's complaint is pushing some Democrats closer to the question of impeachment. Yamiche Alcindor joins Judy Woodruff for more.

As the Democratic presidential candidates angled for attention in Iowa, new polling suggested a shifting political reality. Sen. Elizabeth Warren has stepped into first place in that state, over former Vice President Joe Biden and Sen. Bernie Sanders. For candidates who didn't make the top slots, the new numbers are making them rethink their strategies. Lisa Desjardins reports.

To inspire and embolden seniors to stay active, the nonprofit My Jump grants wishes like the chance to skydive, ride in the Goodyear blimp or drive a race car. The NewsHour’s Julia Griffin reports.

Amy Walter of the Cook Political Report and NPR’s Tamara Keith join Judy Woodruff to discuss the week’s political news, including a new poll that shows Iowa voters favoring Sen. Elizabeth Warren, Sen. Cory Booker’s scramble to raise enough campaign money, and why a whistleblower complaint withheld from Congress may make some reluctant Democrats reconsider formal impeachment proceedings.

In our news wrap Monday, Afghan special forces attacked a Taliban hideout in Helmand Province, killing at least 40 civilians attending a wedding party next door at the bride's home. Officials said 22 Taliban fighters were killed as well. Also, Hong Kong's transit systems returned to normal after weekend demonstrations once again turned violent.

Iowa plays an outsized role in presidential politics, and new poll numbers from that state could influence how different Democratic candidates' focus their campaigns. The poll by The Des Moines Register and CNN puts Sen. Elizabeth Warren two points ahead of former Vice President Joe Biden, with Sen. Bernie Sanders in third. Judy Woodruff breaks down the numbers with J. Ann Selzer of Selzer & Co.

As one of the world's biggest and best-known movie stars, Brad Pitt is spending as much time helping get films made as he is acting. His latest project, "Ad Astra," is about a journey to the far reaches of the solar system, as well as the journey inward for a tortured soul. Pitt sits down with Jeffrey Brown to discuss his career, and why he helps make movies when he’s not the star.