Yes, I think it would! Not an expert though, but logically I think that should work! Depends on the angle, though, of course

My English isn’t Englishing atm, bear with me. Heat island effect is caused (amongst other things) due to sealed ground. So replacing asfalt roads, and even brick sealings with green space or even better water, should help regulate temperature. On top of this, instead of white roofs, green roofs are also a good option

Why specifically Germany? And why is it at the top of your list?

Mean girls

I think it serves a purpose. In the Netherlands you don’t get plastic bags for free anywhere anymore, so everyone I know tends to have some with them to reuse, instead of amassing huge amounts at home in a bag-bag