[dkarl]

Why do you want them to go outdoors, though? You could get more teens to go to the library by turning off all the lights and playing dance music at high volume, but it wouldn't serve the reasons that made you want them to go there in the first place. Instead of spreading the benefit of the library to more people, it would destroy the benefit of the library for everybody (and it would probably make a pretty poor nightclub, too.)

If you want kids to get a little bit of exercise and breath clean air, clean up urban air quality and create walkable cities with park space. Then people who want a busy social outdoor space and don't mind a lot of mechanical noise will have a place to go where their enjoyment won't interfere with the enjoyment of people who want to hear birds and insects and trees moving in the wind.