One thing that I really really like about living in Amsterdam, is that we have trees and plants everwhere. Also, for 2 years now, city stopped cutting most of the plant growth in parks and on the side of roads. Its so beautiful green and colourful now and insects are having a great time. I counted this year already 6 different sorts of humblebees in my garden.
Still, apparently Amsterdam somehow doesn't satisfy the 30% criterion at all. Can anyone find detailed numbers? I live there and my street is lined with large trees.
This is a good reminder that "green" does not have to mean perfectly manicured
One of the reasons I moved from London to the town I'm in now was how much effort our local council puts in to maintaining the town's greenery. There's dedicated wildflower areas all over the place to encourage insects, which in turn encourages the bird life.
Also us Dutchies have this thing called "tegelwippen":
https://www.nk-tegelwippen.nl
It's a competition about which municipality can remove most pavement tiles & replace with greenery.
People do this on their own too - guerilla gardening style. It's not uncommon to ride through a city street, and see a strip of pavement tiles removed & some flowers in there. Or some plants dangling from a pot attached to a street light. As long as postal workers & elderly people with strollers can still pass, most municipalities support this.