Summers in most parts of India have usually been harsh. However, sunset would bring some relief. The evening breeze and lower temperatures allowed the human body to recover from daytime stress. But this pattern is changing. Nights have become uncomfortable, especially for those without access to air conditioning. A recent study by Climate Trends, a Delhi-based climate research organisation, in medium- and low-income residential units in Chennai, showed that the peak night temperature was not very different from that experienced by people during the hottest part of the day. Research on the ways this changing........

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