OXFORD: As climate change brings more frequent and extreme heatwaves around the world, demand for air conditioners is soaring, with 10 new units sold every second on average - but the poor may be left to swelter, said a University of Oxford researcher.

By 2050, energy use for cooling is projected to triple, while in hot countries like India, China, Brazil and Indonesia, it is expected to grow five-fold, the World Bank has said.

"By the end of the century, global energy demand for cooling will be more than it is for heating,” said Radhika Khosla, who leads an Oxford Martin School programme on future cooling.

But not everyone will be able to afford to beat the heat.

“Traditionally, energy poverty has been defined as people not having heating. Now that is potentially going to shift, and we could have cooling poverty,” Khosla warned on the sidelines of a conference on efforts to slash planet-warming emissions.

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