Pakistan's children are losing weeks of education each year to school closures caused by climate change-linked extreme weather, prompting calls for a radical rethink of learning schedules.

Searing heat, toxic smog and unusual cold snaps have all caused closures that are meant to spare children the health risks of learning in classrooms that are often overcrowded and lack basic cooling, heating or ventilation systems.

In May, a nationwide heatwave saw temperatures up to seven degrees Celsius above normal, hitting 45C (113 degrees Fahrenheit) in Punjab and prompting several provinces to cut school hours or start summer holidays early.

"The class becomes so hot that it feels like we are sitting in a brick kiln," said 17-year-old Hafiz Ehtesham outside an inner city Lahore school.

"I don't

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