Environment

As evacuation orders are lifted, people in Los Angeles are returning to their homes--if their homes survived. But the disaster doesn't end when the fire stops. A single block and a half separates the Altadena home of Jennifer and Ed Barguiarena from complete destruction. Just down the street lies charred, flattened debris. But for families like the Barguiarenas — the seemingly lucky ones, whose houses survived — an altogether different ordeal is just beginning. The water still isn't safe to drink, cook or wash with. There are fine layers of ash and dust in people's homes and yards. And families like the Barguiarenas are also worried about what they can't see – the possibility that toxins like lead and asbestos might have drifted into their homes. For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org Email us at considerthis@npr.org Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Will Rogers State Historic Park is a vast stretch of natural space in the Santa Monica Mountains. It's a treasure to Angelenos. People get married there, picnic there, and have kids' birthday parties on the great lawn. The park's namesake, Will Rogers, was a vaudeville performer, radio and movie star, and was known as America's "cowboy philosopher." His nearly century-old ranch house is the park's centerpiece. It's survived a near miss with wildfire before. Last week, as firestorm engulfed large parts of Los Angeles, this piece of American history was reduced to rubble. For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org Email us at considerthis@npr.org Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Over 29,000 acres in the greater Los Angeles area are on fire right now. The fires emerged after the Santa Ana winds swept into the Los Angeles area Tuesday. The largest is the Palisades fire, which is quickly burning through the Pacific Palisades and Malibu communities. It's one of four ongoing critical fires — only one of which is partially contained. Ahead of the windy week, a Red Flag Warning was issued for an increased fire risk due to the strong winds, low humidity and higher temperature. Today, we dig into the Santa Ana winds: What they are and how they combined with other factors to create conditions for the most destructive fire in Los Angeles' history. Questions, story ideas or want us to dig more into the science underpinning natural disasters? Email us at shortwave@npr.org — we'd love to hear from you! Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Extremely dry conditions coupled with high winds have led to an explosive wildfire situation in southern California. Multiple fires have erupted across the Los Angeles area since Tuesday. Tens of thousands of people have had to evacuate, and firefighters are struggling to contain the flames. Adria Kloke is one of the people who has had to flee. She packed up her belongings, along with her cat, and left her home in Pacific Palisades on Tuesday. Kloke shares her story with NPR. For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org Email us at considerthis@npr.org Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Snowflakes. These intricate, whimsical crystals are a staple of magical wintry scenes, but how big can they really get? Well, according to the Guinness World Record keepers, the "largest snowflake" ever recorded was a whopping 15 inches in diameter. It was spotted near Missoula, Montana in 1887. But Kenneth Libbrecht, a physicist at Caltech, has long been skeptical of that record. So he set out to find what makes a snowflake a snowflake and whether that 1887 record is scientifically possible. You can read more about what he discovered here. (encore) Want to share the snowflakes you've spotted this winter? Email us a photo at shortwave@npr.org. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

The region drained by the Amazon River, including the Amazon Rainforest, is in the second year of a punishing drought. That has lead to the lowest water levels in more than 100 years for the Amazon and its major tributaries. Millions of people and an array of wildlife depend on those quickly disappearing waters. In a story we first brought you in October, we travel to the region to see the effects. Support our non-profit journalism by joining NPR+ Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Norway is the largest exporter of salmon in the world. And while some of those fish are wild-caught, many are raised in "fish farms"- large cylindrical pens made of nylon in the open water. Sometimes these farmed fish escape, mixing with the local population and causing ecological issues. In a story we first brought you in October, we see farmed fish in a Norwegian fjord and hear about potential solutions to the problem. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

In the early 20th century, a blight fungus wiped out most of the 4 billion American chestnut trees on the eastern seaboard. The loss was ecologically devastating. Short Wave host Emily Kwong dives deep into how scientists are trying to resurrect the American chestnut tree — and recent controversy over a plan to plant genetically modified chestnuts in the wild. Want to hear about more efforts to recover endangered or lost species? Let us know by emailing shortwave@npr.org! Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Old mines leave behind a a pressing problem: Huge holes that make the landscape look like a chunk of swiss cheese. But in Germany, some scientists and city planners are turning these into lakes. The largest one will be the biggest artificial lake in Germany when it's done, with a shoreline of 26 kilometers or about 16 miles all around. But it's not as easy as simply filling the holes with water. It takes a LOT of research to get this science right. Interested in more environmental stories? Email us at shortwave@npr.org. We'd love to hear from you! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

If you crossed WALL-E with a floor lamp, it might look a little like the PhytoPatholoBot. These robots aren't roving through space or decorating a living room — they're monitoring the stems, leaves and fruit of Cornell AgriTech's vineyards, rolling down each row and scanning for mildew. In this episode, host Emily Kwong and producer Hannah Chinn take a trip to Cornell to check out these new robots. How do they work? How effective are they? And what do local grape farmers – and neighbors – think about them? Interested in more robotics stories? Email us at shortwave@npr.org. We'd love to hear from you! Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Centuries ago, Southwest tribal nations tended vast orchards of peach trees. But in 1863, thousands of those trees were cut down by the United States government when it ordered the Diné to leave their land as part of the Long Walk. Horticulturalist Reagan Wtysalucy wants to bring that those Southwest peaches back. Want to hear more Indigenous science? Email us at shortwave@npr.org to let us know! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Chile is poised to create it's 47th national park in the coming year, protecting wilderness at the southern tip of South America. That's thanks in large part to the work of a U.S. conservationist and her organization. We go to the bottom of the world to see the stunning landscape that will make up the park. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Joe Biden's first and last trip to Africa as president wrapped up in a port city in Angola. It's the end of an 800 mile train line connecting the port to massive mineral deposits in Central Africa. The U.S. and other Western countries are raising billions to upgrade the rail line, a move that is seen as an effort to counter China's investments in mining in the region. We go to one of the mining cities along that train route to see how the geopolitics are playing out. Support NPR and get sponsor-free episodes of State of the World. Sign up for NPR+ at plus.npr.org Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Monarch butterfly populations have plummeted due to habitat loss, pesticide use and climate change. In early December, the U.S. Fish and Wildlife Service is going to decide whether the monarch should be listed under the Endangered Species Act. If that comes to pass, the migratory butterfly would be one of the most widespread species to receive this listing. Want to hear more on the animals that surround us? Email us your ideas to shortwave@npr.org — we'd love to hear from you! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

SpaceX's Starship rocket took off again Tuesday for its sixth test flight. Crowds, including President-elect Donald Trump, gathered at the launch site in Texas to watch it fly part way around the world to the Indian Ocean. Starship – the largest rocket ever built – is the dream of Elon Musk, who hopes to make humans a multiplanetary species. But building the rocket is having a real impact on Earth. The launch site is located in the middle of one of Texas' largest wildlife sanctuaries and environmentalists say every launch is causing damage. Plus, how government regulation of launches may change in a second Trump administration. Want to hear more on the future of space exploration? Email us your ideas to shortwave@npr.org — we'd love to hear from you! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

For decades, Coho salmon were turning up dead in urban streams the Pacific Northwest. The salmon would stop swimming straight, and then die before they had a chance to spawn. Researchers worried that unless they figured out the cause, the species would eventually go extinct. Enter a formidable crew of biologists, modelers, community scientists, environmental chemists. After eventually ruling out the obvious suspects — things like temperature, oxygen levels and known toxins — researchers eventually zeroed in on a prime suspect: chemicals in tires. But the question remained: Which one? If you liked this episode, check out our other episodes on satellites monitoring emissions and how air pollution could create superbugs. Want to hear more environmental stories or science mysteries? Tell us by emailing shortwave@npr.org! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

In the humid rainforests of northern and eastern Madagascar reside seven newly described frog species. They often hang out near fast, flowing rivers. These treefrogs' high-pitched, "futuristic" sounds may help male frogs attract females over the sound of nearby rushing water. They also are what inspired their Star Trek-themed names. Have another animal you want us to dig into for a future episode? Email us at shortwave@npr.org! Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Norway is the largest exporter of salmon in the world. And while some of those fish are wild-caught, many are raised in "fish farms"- large cylindrical pens made of nylon in the open water. Sometimes these farmed fish escape, mixing with the local population and causing ecological issues. We see farmed fish in a Norwegian fjord and hear about potential solutions to the problem. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Even though there are more than 10,000 rock glaciers in the western United States, most people would look at one without knowing it. Unlike the snowy glaciers we're more familiar with, rock glaciers are under-researched and hiding in plain sight. But inside these glaciers covered with rocks is a little bit of climate hope. Read more of science correspondent Nell Greenfieldboyce's reporting here. Want to know more about the hidden science of the world? Email us at shortwave@npr.org — we might cover it on a future episode! Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Hurricane Milton tore a path of destruction through Florida late Wednesday, leaving multiple dead and wrenching buildings apart. Many across the southeastern U.S. were still struggling to recover from the devastation of Hurricane Helene, which hit less than two weeks ago. Now, residents and officials must again navigate the clean up rescue and recovery efforts. For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org. Email us at considerthis@npr.org. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy