Higher temperatures reduce "the level of physical activity that a person can safely sustain without experiencing an uncontrolled rise in body temperature" is ha

Higher temperatures reduce "the level of physical activity that a person can safely sustain without experiencing an uncontrolled rise in body temperature" is hardly surprising. For those of us who have lived in a hot climate its a statement of the obvious. Not only that, its a lot harder to concentrate so it affects mental work as well as physical. That is why, for example, air conditioning is an aid to productivity in hot climates - Lee Kuan Yew claimed air conditioning was a critical factor in Singapore's prosperity.