Youths tell trial of climate change toll, from anxiety to flood and heat impacts

The trial that began Monday heard in an opening statement from the youths’ lawyer, Catherine Boies Parker, that the case is not about the existence of climate change but rather whether the government is “constitutionally required to stop making it worse.”

She said the Charter must protect youth from their own government’s actions.

Vipond told the court on Tuesday she had experienced several climate change events since the floods, including wildfire smoke and intense heat.

“I’ve been seeing these impacts all my life, and I’ve been seeing how these impacts are getting worse,” she said, adding that they had taken a toll on her mental health.

“I am very nervous for these one-in-a-century events to become more frequent and more and more impactful.”

Vipond testified that she joined the case when she was 13 years old, after appealing to Calgary City Counsel to adopt a climate recovery plan in the city. Now, she’s looking for a more national response.

“I want to see the creation of a plan for my country because I’m scared for what my future is going to look like and what the future for future generations will look like,” she said.

“I want the courts to know we are doing this for our future and we are all, at the end of the day, kids wanting to hold our governments accountable to be able to make our future safer and better for everyone to come after us.”

Another plaintiff, Sophia Sidarous of the Metepenagiag First Nation in Eastern Canada told the court climate change had had an impact on Indigenous cultural practices, including the cancellation of sweat lodges for safety reasons due to intense heat.

She said this took away the ability “to be cleansed” and to “learn from the elders while they’re still here.”

She described removing herself from powwows to sit in air-conditioning with her young son, and the decline in availability of traditional foods, including salmon and moose. She said traditional plants such as chaga, a type of medicinal fungus that grows on birch trees, have started disappearing.

“Due to the rising temperatures and unprecedented wildfires in the Atlantic, a lot of the birch bark trees are being impacted by that, and so the chaga that grows on those birchbark trees are burning or dying because the tree isn’t healthy,” she said.

Others among the 15 youth plaintiffs from seven provinces and two territories are expected to testify about how they have suffered what their lawyers call “specific harms connected directly to the government’s conduct.”

The court has heard these include respiratory illness worsened by wildfire smoke, displacement due to extreme weather, mental health impacts, such as climate anxiety, and loss of cultural connections to the land that has been lost due to climate disasters.

Earlier Tuesday, climate science professor Kirsten Zickfeld from Simon Fraser University testified that while science can inform the emission reductions needed to meet targets, how that is achieved is a matter of policy.

She said models suggest Canada has “exceeded its fair share” of its “carbon budget.”

Zickfeld explained the concept of a carbon budget, the maximum amount of carbon dioxide emissions that can be released while keeping global warming “around 1.5 degrees” and “well below” two degrees Celsius, targets set in the binding 2015 Paris Agreement that includes Canada.

She said that to stabilize global temperatures, there’s a need for “net zero” emissions, in which man-made emissions and man-made removals of carbon dioxide from the atmosphere even each other out.

Zickfeld told the court that carbon budgets around the world are calculated based on principles of “equity, capability and responsibility” and the calculations suggest “Canada’s carbon budget is essentially zero or negative,” indicating that it has already surpassed its fair share of emissions.

Canada, she said, was among the 10 largest emitters of greenhouse gases annually and historically.

“To stabilize global average temperature, global carbon dioxide emissions need to be reduced to at least net zero and the emission of other greenhouse gases such as methane and nitrous oxide need to be strongly reduced,” she said.

But Zickfeld said under cross-examination that while science helped determine the targets, it “doesn’t provide the path” to meeting them.

The trial comes about seven years after the case was first filed in 2019. It is expected to continue into late November, with closing arguments scheduled for February.

More plaintiffs are expected to testify on Wednesday.

This report by The Canadian Press was first published Oct. 27, 2026.

Brieanna Charlebois, The Canadian Press

by The Canadian Press

Youths tell trial of climate change toll, from anxiety to flood and heat impacts

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