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The top left residential area doesn't seem quite as well established as the bottom right, so perhaps here using street trees, green buildings and pocket parks. You could argue the area between this and the industrial area below actually need greening in order to connect all these area. I would say either of the residential though, as this is where people live and commute. Industry is important to negate effects of industry, prevent run-off, mitigate flooding etc, but people will largely be indoors during the working day.