Environment Issues in Delhi

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For the last decades, the Delhi government have been running a campaign to get people to plant trees and plants, to make Delhi green. It has turned out to a great success, you can nowadays see the blue sky. With this, public transports have started to run on CNG to make it even better. But these days, everybody wants a car and the cars runs on fossil fuels. Is Delhi's sky going black again? Was all that work just for nothing? I think the ideal solution would be for people to start running on "green" fuels, such as ethanol and biogas. What do you think, how can we prevent this from happening?