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Hello and welcome to the Intelligence on Economist Radio.

I'm your host, Jason Palmer.

Every weekday, we provide a fresh perspective on the events shaping your world.

China's president Xi Jinping shocked the world when he pledged last week that the country would be carbon neutral in 40 years' time.

That will be an enormous task.

We ask how it can be done, if it can, and examine the global effects that could have.

And Switzerland relies a lot on referendums to gauge the will of the people.

One that happened this weekend involved a giant game of pickup sticks,

and the outcome reveals the shifting attitudes the Swiss have towards the European Union.

But first... You never give a tax return when you're being audited.

They're extremely complex. People wouldn't understand him.

Now the House goes and starts subpoenaing. They want to know every deal I've ever done.

Since declaring his candidacy for president, Donald Trump has refused to share his tax returns

and gone to court to stop them being released.

But on Sunday, the New York Times published an investigation into more than 20 years' worth

...