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Temperatures continue to reach extreme highs across many parts of the world.

Air quality alerts are again in force for millions of Americans because of smoke from some 900 wildfires burning across the border in Canada.

A heatwave is continuing across southern Europe, with forecasters in Italy predicting temperatures of 46 degrees Celsius on the island of Sardinia.

Hot weather alerts are also in place across most of Spain, where there have been reports of power cuts as demand surges because of air conditioners.

Meanwhile, wildfires raging close to seaside resorts south of Athens have destroyed untold numbers of homes and cars.

At the weekend, China issued several temperature alerts and in Japan, dozens of people were treated for heatstroke as temperatures reached highs of 39.1 degrees Celsius.

Daniel Swain is a climate scientist at the University of California, Los Angeles. He told Newsday: 鈥淭he extraordinarily warm years today will seem ordinary in just a decade or so from now so this really is a preview of what it will look like most of the time in the medium-term future and what might actually look like a cool year several decades from now.鈥�

(Picture: Shows human hands holding a world, which is half burning. Credit: Getty Images.)

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