India, April 3 -- Grey and blue - the colours have the exact same number of letters and yet, spur vastly different ideas. That's perhaps why similes or phrases such as, "as blue as the sky" or "clear blue sky" don't make for obsolete expressions. But only two weeks ago, could you have used such a turn of phrase to describe the city sky? How or why can you now? The lockdown has curbed human interference in nature's way of work. Empty roads, reduced emissions, limited industrial waste and most importantly minimal plastic deposition has helped the environment heal. For some time, the sky hasn't looked grey, sullen or smoky. The mild progress brings us to a rather pertinent point; can ecological balance be restored through curfews on human activity? Environmentalists based in Mumbai share their insightful take on the situation....