Four government departments call for "every unit of water to be used carefully" as the world's second-largest economy is hit by record temperatures, flash floods and droughts.
The heat wave began on Sunday and could "last nine or ten days, which would make it one of the three longest heat waves Spain has seen since 1975," Spain's meteorological agency AEMET says.
Japanese weather agency said Sunday’s temperatures exceeded 35 degrees C at 233 observation points across the nation by mid-afternoon.
In a survey of 52 countries, those most at risk included India, China, Mozambique, Sudan, Brazil, Pakistan and Bangladesh, says a report by Sustainable Energy for All group.
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