Why is it so hot in Europe?

An extreme heat wave is gripping much of Europe, breaking records and causing widespread misery. Temperatures soared well over 100 degrees Fahrenheit in France, Germany and Spain. While the heat is coming from sub-Saharan Africa, some researchers say climate change is exacerbating and prolonging it. They warn more record highs are likely--and along with them, more deaths. William Brangham reports.

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