Large swathes of Asia continue to swelter though a dramatic heatwave that has topped temperature records all the way from India to the Philippines. Bangladesh has faced the hottest April on record, with temperatures forcing millions of children to stay home from school and making working in the scorching heat difficult for millions. The heatwave is also leading to water shortages. But that term is one that water supply expert Isha Ray from the University of California, Berkeley does not like. She has been speaking at a conference in Paris called "Facing Environmental Crisis in South Asia" and told us in Perspective why she thinks the term is misleading.