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Could global warming make some states uninhabitable? With parts of the US sweltering in record-breaking heatwaves, the Americast team wonders whether cities like Phoenix in Arizona can continue to survive by the end of the century.

Meanwhile, Sarah enjoys cooler temperatures in Colorado and catches up with the UK Foreign Secretary James Cleverly at the Aspen Security Forum.

And Hollywood strikes have held up the Barbie film's press tour, but could politicians learn a thing or two from its internet-breaking marketing campaign?

HOSTS:\\n\\u2022 Justin Webb, Radio 4 presenter\\n\\u2022 Sarah Smith, North America editor\\n\\u2022 Marianna Spring, disinformation and social media correspondent\\n\\u2022 Anthony Zurcher, North America correspondent

GUEST:\\n\\u2022 James Cleverly, UK Foreign Secretary

GET IN TOUCH:\\n\\u2022 Send us a message or voice note via WhatsApp to +44 330 123 9480\\n\\u2022 Email Americast@bbc.co.uk\\n\\u2022 Or use #Americast

Find out more about our award-winning \\u201cundercover voters\\u201d here: bbc.in/3lFddSF.

This episode was made by Daniel Wittenberg, with Rufus Gray, Natasha Fernandes and Catherine Fusillo. The technical producer was Dafydd Evans and the sound designer was David Crackles. The editor is Jonathan Aspinwall.