Extreme heat is building in the western United States, with record-breaking temperatures forecast for California and Nevada. It comes just weeks after another dangerous heatwave. The latest surge follows the hottest June on record for the US and a heatwave estimated to have killed nearly 200 people. Al Jazeera’s Alexi O'Brien reports. - Follow us on Twitter: - Find us on Facebook: - Check our website: #Wildfires #CaliforniaWildfires #USheatwave
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