This is a feild which is home to many plants and and animals.
But when we build things like homes and new buildings we take down those trees and the animals the lived in the forest now don't have a home.
This effects the ecosystem because when we cut down the trees and plants that make our oxygen we don't have clean air. It also effects the food cycle when we cut down bushes and threes that grow nuts and berries so the animal that live in the forest will die from starvation.
When we build cities and towns we tear down more and more and more trees every single year.
Then those animals look for homes and might be found in your basement.
Or birds might whined up in your attic because the don't have home but you can solve that problem by putting out bird houses.