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.

The South Asian monsoon is more than just a weather system. Its rhythms control the region's

agriculture, its annual supply of freshwater, and ultimately the fortunes of well over a billion

people. As climate change disrupts those rhythms, South Asians must change with them.

And there's been another change of style, per-tailor swift. The singer has long had a treacherous

relationship with streaming services. The last time she released an album, it didn't go live on

Spotify for three weeks. Now everything has changed, and the love story is back on.

First up, though.

In a debate earlier this month, Democratic contender Elizabeth Warren proposed a new direction

for American nuclear policy, committing to what's called no-first use. In January, she'd

introduced a Senate bill to mandate it. Those who support a policy of no-first use, or NFU,

say its absence means there's more risk of accidental nuclear war.

We increase the odds that there will be a miscalculation, and that someone will believe that we

have used nuclear weapons or sentiment in their direction when that is not the case.

This is about trying to keep America safe, or not about playing politics.

NFU pledges are common. China and the former Soviet Union committed themselves to versions of it.

India has, too, although its defense minister recently hinted that it may be revoked.

In America, NFU goes against several decades of nuclear thinking. But antagonistic talk and

policies from President Donald Trump have left many worried about disaster. At the recent G7

summit in Beirut's, Mr. Trump said he would be open to meeting with Iran's President Hassan

Rouhani, yet his withdrawal from the nuclear treaty with Iran in the first place

...