India, May 14 -- On April 27 this year something unusual happened. The planet's 50 hottest cities were all in India. Recent years have been the hottest on record since systematic data was recorded. The country is warming at roughly 0.15degC per decade, with average temperatures rising nearly 0.9degC above the long-term baseline in just the last decade. Heatwaves that were once confined to the north of the Vindhyas, now reach coastal Odisha and Kerala. As a sub-tropical country, India is on the front-lines of many aspects of warming, but in an immediate sense, what should concern parents and educators around the country is what this warming does to 250 million children taking exams during the hottest months of the year.

A new study by res...