Aside from the bombs, the starvation and the disease, Palestinians struggling to survive in Gaza last week also had to handle 40 degrees Celsius-plus temperatures. They do not have the luxury of air conditioning and most do not even have shelter. Water is scarcely available and diseases rampant. But it is not just in Gaza and other war zones where extreme heat is a killer. It is now baked into the summer schedules of most countries, even in the Northern Hemisphere, as global warming sends the mercury ever upward and for longer periods.