India, June 2 -- Each year, when the UN-designated World Environment Day is observed on June 5, it is a moment to reflect on where we stand and where we must head. This year, as I write, my city Delhi is burning; it is a living inferno. We know these increasing heat levels are because of climate change-that is now irrefutable. But it is equally, if not more, a product of the way we build our cities: the increasing use of concrete, the waste heat from vehicles on the roads and air conditioners on our windows. We are also building without insulation, ventilation or shading to protect us from the scorching sun. This, without the natural cooling of trees or waterbodies, which are collateral damage of this building boom, makes heat a killer, q...