How can we make our cities more environmentally friendly? (0)

How can we make our cities more environmentally friendly?
If I walk along the city streets, I feel a terrible smell. That comes from cars. It makes me feel very ill. Then I just have to step on trash , because people can’t wait and look for a bin. That’s why our streets are so dirty . Everywhere I go, there are always some workmen building big houses .
If we improved public transport or made electric cars, our streets wouldn’t be so polluted. In Tallinn, for example, the air there is so polluted, that you can hardly breathe there.
If the authorities put bins everywhere in the streets, our cities would be cleaner . The second thing is, that people still drop litter on the ground , even if there is a bin somewhere nearby.
If we didn’t build so much houses all around cities, we could save money from that and better build animal parks, green areas and playgrounds for children . If there were more green areas, people would have more oxygen .
All in all, we must understand the importance of oxygen and where