美国东部遭遇创纪录热浪，7月4日庆祝活动受影响

AMNA NAWAZ: Good evening. I'm Amna Nawaz. Geoff Bennett is away. On the "NewsHour" tonight: Record-breaking heat bakes the Central and Eastern United States ahead of July 4 celebrations. African soldiers lured by promises of high pay end up on the front lines of the war with Ukraine, facing almost certain death. And one year since the deadly flood at Camp Mystic, two parents who lost their daughter remember her legacy and describe their push for better camp safety. LARS HOLLIS, Father of Virginia Hollis: Keeping teachers, campers safe is a guiding light for us and why we're so involved in the protection of campers throughout the U.S. (BREAK) AMNA NAWAZ: Welcome to the "News Hour." Americans across the East Coast are preparing for one of the hottest Independence Days in recorded history. A brutal heat wave is bringing dangerous temperatures to some 160 million from Mississippi to Maine. Record-breaking triple-digit temperatures have disrupted travel, strained the energy grid, and forced some communities to change or cancel planned celebrations. Yesterday, more than 100 people in Pennsylvania were treated for heat-related illnesses at an event tied to the 250th anniversary celebration. In the capital, today's events on the National Mall were postponed for hours because of the extreme heat. And, in New York City, where the heat index was expected to reach 110 degrees today, Mayor Zohran Mamdani urged residents to take precautions. ZOHRAN MAMDANI (D), Mayor of New York City: What we ask New Yorkers to do is to be mindful of the danger that accompanies those temperatures. That means make sure that you stay hydrated, make sure that you're putting on sunscreen, make sure that you're taking as many breaks as possible from being outside. And, if you can, to stay indoors and to stay in air conditioning. AMNA NAWAZ: Meanwhile, health authorities in Europe have now linked thousands of excess deaths to record heat. To unpack it all, we're joined now by Jeff Goodell. He's a contributing writer at "Rolling Stone" and the author of "The Heat Will Kill You First: Life and Death on a Scorched Planet." Jeff, welcome back to the "News Hour." Thanks for joining us. JEFF GOODELL, Author: Thank you for having me. AMNA NAWAZ: So there's heat advisories in effect in almost 30 states. The National Weather Service said today's temperatures are extremely dangerous. What are the risks here and who's most vulnerable?

JEFF GOODELL: Well, the risks are tremendous. I mean, anyone who goes to the doctor knows the first thing they do is check your body temperature to see when things go wrong. Our bodies are very sensitive to changes in heat, and it makes these kinds of outdoor events on weekends like this all the more dangerous. I mean, these extreme -- being out in extreme heat puts a lot of strain on your heart. So anyone with any kind of heart conditions, often, that means elderly people are most at risk. Young children, especially before the age of 2 or so, have not fully deve