Answer:
Popuation effects the habitat because car fuel for example if too many people use cars often it can effect the animals and plants which they eat.
Some animals habitats are in cold countries like the North Pole and when we use are heating and turn it up to high all the smoke travels around the world and sometimes gets so hot it can melt the snow.
That is why we should all do are bit for the enviroment.
Thankz hope this answered your question. :)