Economic Times: At the UN General Assembly in New York last September, I had the honour of sitting down with Prime Minister Narendra Modi to discuss our shared interests, including policies that encourage sustainable economic development and the role that cities can play in supporting them. As the special envoy for cities and climate change for UN Secretary General Ban Ki-moon, I was especially impressed with the PMs ambition to create 100 smart cities, where clean energy will power green economic growth, while...