http://www.straitstimes.com/breaking...een-spaces-201

New Housing Board estates and private condominiums may soon be required to set aside a stipulated amount of green space.
Minister of State for National Development Desmond Lee said on Thursday that the Ministry would be exploring the possibility of introducing a minimum requirement, as a way to ensure "pervasive" greenery continues to exist in Singapore.
"Where new developments displace existing greenery, (they) should fully or partially replace the lost greenery by other means," he said. These could take the form of landscaping, rooftop gardens, or vertical greenery like green walls, he elaborated.
He said that MND will also study how to add more greenery to public infrastructure such as sheltered walkways and bus shelters. No further details were available at this stage. Mr Lee was speaking at the International Skyrise Greenery Conference held at the Singapore Expo on Thursday part of the inaugural GreenUrbanScape Asia exhibition.