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It's our encore. online and in stores. I'm Ariana Brocious.

And this is Climate One.

Before we get into this week's show, there is a huge piece of climate news we need to talk about.

The Environmental Protection Agency announced a big rollback recently that could undermine the whole regulatory basis of government climate action.

Here's agency head Lee Zeldon.

We want to hear from the American public to finalize a regulation that not only proposes to rescind the

endangerment finding, but all greenhouse gas emissions that followed on light, medium, and heavy-duty

vehicles.

That term he used, endangerment finding, sounds obscure and legalistic, but it's hugely important.

Yes, and Ariana, you and I both agree that it's hugely important for everyone listening, for you listening right now to understand what it means.

The endangerment finding, that's a determination made by the Environmental Protection

Agency in 2009. It says that greenhouse gases endanger public health and welfare. This

finding created the legal basis for regulating climate pollutants, like emissions from vehicles

and other sources. It underpins so many federal climate regulations.

So Trump's EPA is undermining the agency's own power by rejecting this finding from 15 years ago.

And this could have a huge impact on how the government regulates emissions or doesn't, because it's

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