What on Earth?

This week, Jo goes inside the courtroom as an historic climate lawsuit gets underway in Vancouver. Fifteen young Canadians have hauled the federal government to court, arguing its response to climate change violates their constitutional rights. We find out what the case could actually mean for Canada’s climate plans. Guests: Leandrea Reeves, one of the 15 plaintiffs in the La Rose v. His Majesty the King lawsuit David Wu, one of the lawyers for the plaintiffs Julien Beaulieu, co-founder of the Canadian Climate Litigation Observatory and researcher at the Grantham Research Institute Another What On Earth? episode you might like: Eco-thugs be warned! You could be charged with ecocide Background reading: Historic lawsuit challenging government over climate inaction begins trial hearings Have you got something to say about this episode? Email us at earth@cbc.ca This episode includes a clip of Patrick Stewart speaking on Empire Magazine’s YouTube channel, published on September 9, 2009.

Sixty-five bats dropped dead inside a home custom-built to protect them. What went wrong? For bat moms looking for a place to raise their pups, it’s not the rent that’s through the roof, it’s the temperature. But bat people are busy building them safer homes: from tiny condos with emergency exits to mini bark roosts stuck to trees. Guests: John Saremba, bat ambassador, Burke Mountain Naturalists Society Bat Program Leah Rensel, PhD candidate in wildlife biology, University of Montana Cori Lausen, director of bat conservation, Wildlife Conservation Society Canada Caroline Lafond, wildlife technician, Okanagan Nation Alliance Another What On Earth? episode you might like: Bats vs. wind energy: a gory tale of two climate solutions Video: Bats have a housing crisis. And it's getting worse Background reading: Wind turbines keep killing bats in Canada. Advocates say this needs to change As white-nose syndrome threatens bats nationwide, this scientist’s probiotic ‘cocktail’ could save them Have you got something to say about this episode? Email us at earth@cbc.ca

Mountains of sargassum seaweed are choking Caribbean beaches. It’s so dangerous it’s shut down a school. Scientists point the finger at climate change, but solutions are on the horizon. We head to the tropics to learn about a WALL-E inspired robot vacuum and a seaweed-powered car Guests: Chuanmin Hu, oceanographer at the University of South Florida Mike Allen, professor at the University of Exeter and cofounder of marine robotics and clean technology company SeaGen Legena Henry, CEO and founder of Rum and Sargassum Incorporated Another What On Earth? episode you might like: Is this Super El Niño a peek into forever weather? Video: This seaweed invasion is so big you can see it from space Background reading: Huge masses of foul-smelling seaweed in the Caribbean could cause headaches for sun-seekers Have you got something to say about this episode? Email us at earth@cbc.ca

Alberta has the country on tenterhooks as the province votes on whether to consider splitting from Canada. At least one separatist leader says the threat to leave is serving as leverage for the oil industry. Others in the province say investment in renewable energy is already taking a hit. This week we’re asking how past fights over the oil sands got tangled up with separatism, what the referendum means for Alberta’s energy industry now, and what an independent Alberta would mean for the climate. Guests: Chris Severson-Baker, executive director of the Pembina Institute Mitch Silvestre, CEO of the Alberta Prosperity Project Firman Latimer, founder and CEO of First Nation Power Development Jennifer Winter, professor and economist who studies climate policy at the University of Calgary, interim director of Canadian governance at the School of Public Policy. Another What On Earth? episode you might like: There's a lot on Carney's plate. Is our climate plan cooked? Background reading: Panelists make cases for and against Alberta separation Separation making Alberta master of its destiny ‘a fiction,’ business leader says Have you got something to say about this episode? Email us at earth@cbc.ca

Depending on who you ask, AI could usher in a green utopia – or the apocalypse. Between those two extremes is a much less hypothetical reality: the technology’s huge impact on our environment now. But tech leaders like NVIDIA’s Jensen Huang suggest it's all worth it, because AI can solve climate problems in the future. So when it comes to emissions cuts, what’s AI done for us lately? And what’s at stake for the climate as more and more chatbots come online? Guest: Ketan Joshi, climate writer, analyst and advocate Another What On Earth? episode you might like: Will Alberta data centres really curb their water use? Background reading: Could AI really 'kill all humans'? Breaking down the dire warnings about the technology's existential risk What's behind the growing backlash toward AI data centres? Have you got something to say about this episode? Email us at earth@cbc.ca This episode includes a clip from the Ezra Klein Show, published by the New York Times, September 2026.

When a meteorologist took a job in Iowa, he was excited to make his forecasts matter to viewers by bringing in climate impacts that were relevant to their lives, like rising costs and energy independence. But then the backlash began, escalating to a death threat. He's not the only one. At climate week in New York City, a group of meteorologists gathered to share stories about speaking to often polarized audiences. When facts become political, how can climate change's frontline communicators stick to the science? Guests: John Morales is the Founder & Lead Meteorologist at ClimaData, a weather consulting firm Chris Gloninger is a meteorologist and senior climate scientist with the Woods Hole Group Video: He talked about climate change in his weather forecast. Then came a death threat Background reading: The Weatherman Who Tried to Bring Climate Science to a Red State I’ve Been a Meteorologist for 40 Years. Here’s Why I Got Emotional About Hurricane Milton. Other What On Earth? Episodes you might like: Is it going to get harder to forecast hurricanes in Canada? Have you got something to say about this episode? Email us at earth@cbc.ca

As parliament gets back in session, there’s a lot going on: a trade war, talk of Alberta separation, and international alliances being redrawn. Prime Minister Mark Carney has been clear: he doesn’t think the old climate plan he inherited from the Trudeau government holds up to Canada’s new reality. So, where does climate fit in what Carney calls the next “world order?” Two of our political journalists break down what we know so far, and what they’re watching for next. Guests: David Thurton is a senior reporter with CBC’s parliamentary bureau in Ottawa Aaron Wherry is a senior writer with CBC’s parliamentary bureau in Ottawa Video: Are Canada’s climate plans cooked? Other What On Earth? episodes you might like: Critics say the math isn’t mathing on Ottawa’s climate plans Is Canada really a climate leader? Background reading: Liberals remove layer of review process for energy projects, backing off bypassing at-risk species protections Canadians should prepare for a 5 C hotter future, report warns Carney says Trudeau-era climate plan was 'too expensive' and 'divisive' Have you got something to say about this episode? Email us at earth@cbc.ca

It’s gonna be a record-breaking few months of weather. A natural surge of warm ocean water is colliding with a planet hotter than at any point in human history – meaning more heat, more floods, more droughts. Some think this Super El Niño offers a window into what climate change will bring, and that it could help us prepare for the decades to come. Scientist Rosa Vásquez Espinoza takes us to Peru, where the phenomenon begins, and where officials have already declared a state of emergency due to heavy, unseasonal rains causing devastation for communities in the Andes and elsewhere. Then, we hear from Andrew Dessler, climate scientist at Texas A&M University, about how this Super El Niño is interacting with climate change and what this year’s weather could teach us about how to adapt to a warmer world. And we wrap with what this all means for Canada. Bill Merryfield from Environment and Climate Change Canada answers pressing questions about the season ahead – such as, “should I buy a ski pass?” Guests: Rosa Vásquez Espinoza, founder of Amazon Research Internacional Andrew Dessler, Director, Texas Center for Extreme Weather at Texas A&M University Bill Merryfield, research scientist with Environment and Climate Change Canada Video: I’ve tracked El Niño for years. I’ve never seen this before Background reading: 'Super' El Niño didn't cause this year's fires and heat waves, but it's about to take us on a 'wild ride' This episode features a clip from Saturday Night Live, created by Lorne Michaels, performed by Chris Farley, 1997, SNL Studios.

She's a CBC science journalist, meteorologist and seismologist. Now she’s taking the helm as the host of your favourite climate change podcast. All summer long, Jo and the team have been cooking up new ideas and stories to help you make sense of our changing world, at a time when the climate is warming and everything else can feel like a hot mess. Have we piqued your interest yet? Good. Here’s a quick rundown of what you can expect from the new season.

Stephen Nelson tried to keep his friend Mario safe in the 2021 heat dome. But tragically, his friend died – in an old building that wasn’t designed for our warming world. This galvanized Stephen to do more to keep his community safe during extreme heat. We visit Vancouver’s Downtown Eastside to meet the tenants, like Stephen, working together to keep each other cool in a changing climate.

From the best of What On Earth: A warmer world is great for rats. (Not so much for us). That’s why cities are seeing a climate-linked rise in rodents. Can birth control reverse that? Producer Molly Segal finds out how Chicago, Manhattan and Vancouver are all trying to make things a little less rattier.

The search for survivors is underway after deadly flooding in Nepal and Tibet. But experts around the world are also unpacking what role climate change played in the disaster. We hear from two experts who know the region well, who say people have been warning that something like this was coming as glaciers warm at an alarming rate. And we find out why a better understanding of the impacts of warming on this region could protect lives.

From the best of What On Earth: Bats and wind turbines are both climate darlings. But after Cori Lausen saw a turbine reduce a bat to a "black banana peel," she set out to find another solution. That experience unlocked a years-long search to understand what was happening and how to fix it. The question looms: as we rush to add wind renewables to the grid, will both ever be able to co-exist on the same landscape?

There was booing and calls of bullsh*t during a recent government town hall in Sturgeon County. It’s where tech giant Meta is building its largest data centre outside of the U.S. Locals have a variety of concerns; we’re zooming in on the promise that this facility will use less water. Can the plans for ‘closed-loop’ cooling help fix AI’s thirstiness? We break down what the tech can do, and what’s really happening at data centres already operating.

From the best of What on Earth - Online communities are hunting for items that last. At #BI4L, members crowdsource reviews and recommendations to try to find the “best” version of, well, everything – from blenders to husbands (really). It’s all in an effort to save money, AND the climate.

If you’ve breathed in smoke, or worse, had to flee your home this summer, you might be thinking more about our warming world. Grand Chief Stewart Phillip hopes this season of fire translates to climate action. As wildfire tears through his territory, the First Nations leader is calling on Mark Carney and Danielle Smith to pause a proposed pipeline. At the same time, pollster Shachi Kurl tells us about a surge in climate concern among Canadians this wildfire season. But will the data lead to political change?

It’s made of mycelium and hemp, it’s better for the earth and it’s now available in Canada. CBC’s Anand Ram introduces us to an American woman who laid her father to rest in one of these biodegradable coffins. And we hear how innovations in green burials are comforting options for those who want to honour their loved ones’ environmental values.

From the Best of What On Earth – Wildfire smoke has choked Canadians across the country this summer. Air purifiers are expensive, but there’s a cheaper way to clean your air indoors. We visit a workshop teaching seniors in Vancouver’s Chinatown to build DIY air cleaners, and get some tips for how you can make one yourself.

From the best of What On Earth – You’ve got climate questions, Hannah Ritchie has answers. She’s “Clearing the Air” in her new book, drawing on her expertise as a data scientist to delve into some of the common — and not so common — queries that come up in climate conversations. Her goal isn’t just to shift opinions on climate action, but to also to spark hope at a time when it may feel like the climate fight is a losing battle.

Flood-prone communities are doing everything to keep water out. But as climate-fuelled storms become more severe, some architects say we need to work with water, not fight it. We learn how amphibious engineering kept Bangladeshi kids in school and allowed a Louisiana community to stay afloat.