New Delhi, June 14 -- India is once again grappling with dangerous heatwave conditions, particularly across its northern, north-western and central regions, after an early monsoon briefly brought relief. Temperatures are around or above 40 degrees Celsius in Rajasthan, Madhya Pradesh, Punjab, Delhi and Haryana, among other places.

Though India is no stranger to extreme heat, warmer nights - an insidious climate pattern - are making summers agonising.

A recent study by the Council on Energy, Environment and Water (CEEW), a policy think tank, found that not only is India experiencing warmer nights, but nighttime temperatures are rising faster than daytime heat, creating conditions that prevent the human body from recovering from daily hea...