Tonight on PBS News Weekend, across the country, a day of protest against President Trump's

moves against federal workers, immigrants, and U.S. trading partners.

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And how weather reports from centuries-old whaling ship log books

are providing scientists new clues about climate change.

We wanted to know if we could extract that weather data to inform climate science.

And it turns out that you can.

Good evening.

I'm John Yang.

Across the country and around the world today,

tens of thousands of people turned out for what organizers say has been the biggest single day of protests

against President Trump and his second term policies and actions.

In this country, more than a thousand rallies were planned

in small towns and major cities from coast to coast.

Ali Rogan begins our coverage.

In Washington, crowds descended on the National Mall, calling for lawmakers to rein in President Trump.

He's right now destroying our economy.

He's taken away all of our allies.

We're a pariah in the world.

And Congress sits back and does nothing.

The mass protest, dubbed the hands-off National Day of Action,

was organized by advocacy groups that opposed the president's policies

...