Children are “uniquely and disproportionately” harmed by climate change, a medical expert told a US federal court Wednesday in a landmark constitutional case brought by young Americans challenging President Donald Trump’s fossil-fuel agenda.

On the second and final day of a hearing in Missoula, Montana, the plaintiffs’ attorneys called Lori Byron — a former pediatric hospitalist with more than four decades of experience — to explain how a warming planet is impacting young people.

The case, Lighthiser v. Trump, is emblematic of a growing global trend of using the courts to push climate action amid political inertia or outright hostility. At issue are three executive orders from the president that together seek to “unleash” fossil fuel development at the expense of renewable energy.

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