I agree. Singapore is the greenest city but it's hardly green. Construction is always dirty, a few trees won't change that. The sands are stolen from other countries.
They dress up the carbon causing steel beams and concrete with trees but don't forget the tree roots also destroy infrastructure, and at the end of the day it's (toxic) lipstick on a pig, and the continuous maintenance of the lipstick until the pig dies. Cities and human habitats are either being reclaimed by nature or fighting it. Until that fundamentally changes green cities are as realistic as carbon negative oil.