Heatwaves happen - but why so many at once?

Temperatures across Europe soared to over 44C this week, with the heatwave expected to continue and reach record highs. Hot weather has also been recorded in China and the USA, but why are so many places so hot at the same time? On the Sky News Daily, Niall Paterson speaks to Sky's climate and energy correspondent Hannah Thomas-Peter who is in Sardinia, one of the hottest places in Europe, about the heatwave there. Plus, our science and technology editor Tom Clarke on what's causing extreme weather across the globe. Podcast producer: Rosie Gillott Editor: Paul Stanworth