As the climate warms, heat waves are lasting longer and reaching greater peaks as average temperatures rise. In turn, government authorities and public health experts around the world are grappling with whether to keep students learning in hot classrooms or encourage them to stay home and keep cool.

Hena Khan, a grade nine student in Dhaka, has struggled to focus on her studies this week as temperatures surpassed 40 degrees Celsius (104 degrees Fahrenheit) in the capital city. "There is no real

South and Southeast Asia braced for more extreme heat on Sunday as authorities across the region issued health warnings and residents fled to parks and air-conditioned malls for relief.