Heatwaves have ravaged much of the northern hemisphere, causing wildfires, destruction and death. Some are blaming heat stress for an increase in chronic kidney disease in Central America. Graihagh Jackson investigates the causes and health effects of heatwaves
Heatwaves have hit many parts of the northern hemisphere this summer, ravaging landscapes and causing death and destruction in their wake. Wildfires have broken out in the Arctic Circle, as well as in California, Sweden and Greece. People are dying from the heat in Japan, where temperatures have risen to over 40C (104F).