Playgrounds have gotten much better than they were a few decades ago when I was a kid. I don’t see any reason that that can’t continue with putting an emphasis on including shade.
This accounts for about 90% of the problem with everything. Voter turnout in my state in the primary, where we have mail-in voting for all (IE: no excuse for people not to vote), during a presidential election year, was below 50%. And then people complain about their elected officials! People don't attend public meetings, they don't contact their elected officials, they don't come to political party meetings or get involved -- but those same people will tell you to your face that both parties are the same and that they feel powerless to fix government! Especially at a local level -- school board, city council, county, and state -- the average citizen has so stinking much opportunity that they don't even realize their own power! You want to get something fixed? Set up a meeting or two with your electeds. Don't get the response you want? Find ways to create a citizens movement. Can't get what you want in your municipality? Find a sympathetic state legislator or two who can push from the top town. Really upset? Run for office yourself or help get the people you want elected.
The best "premium shadow package" available on the market. Comprises: filtered light, relaxing breeze sounds, noise blocker, chirping birds and flowers, dumb squirrels frolicking around and fresh soil, all in the same package for just ten dollars a sapling.
In any case, hedges don't need 20 years to grow.
Will depend a lot on species, age and season of the year. Conifers are more expensive because can't be sold at fall as naked-root trees.
What's more of an issue is
> Canopies are made of [ Plastic ] fabric
typically knitted polyethylene blend | woven polypropylene. The degradation of tens of thousands of kilometers of plastic shadecloth each year is a big source of microplastics in the environment .. which has been getting some bad press of late.
Bathroom bacteria is on paper too.