The brief was full-blooded and reminded me of the illustration challenge 'Draw 50 things', it was only 16 things, but still a lot to cram in. Flats and houses, people, bird boxes, electric cars, recycling bins, window planters and rooftop gardens. Here's the finished piece.
It had to be a birds-eye view to fit everything in, though my suggestion was to have close-ups of neighbourhood folks too, doing green things. This makes the piece a bit more relatable, but also the 4 faces were provided as separate pieces, to be used as needed, dotted around the website, etc, to give the work a bit more mileage.