What are the effects on the ecosystem and what is being done to help ​

Ithink it’s around 500 million or something. kinda scary honestly but that’s just my opinion.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it