Trees provide annual services worth USD 500 mn per magacity
Megacities are home to nearly 10 per cent of the world's 7.5 billion people.
Aug 24, 2017, 09:09 AM IST
Megacities are home to nearly 10 per cent of the world's 7.5 billion people.
Aug 24, 2017, 09:09 AM IST