News of the world's first nuclear fusion reaction with a net energy gain created a lot of excitement, and justifiably so—fusion could one day be an infinitely renewable, carbon-free energy source.

Policy makers, including President Joe Biden, said they want to see a fusion reactor providing electricity to the American grid within 10 years. But scientists say that timeline is probably too ambitious, if not impossible.

On today's episode of our environmental policy podcast, Parts Per Billion, Bloomberg News reporter Will Wade explains the promise of nuclear fusion power, what a realistic timeline for its development looks like, and whether it might draw research funding away from other renewable energy projects.

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