The problem is that there are over 5 billion people on the Earth, and they all need shelter, fuel, food, clothing and water. The environment can provide all these things if we look after it.
Some countries take more than their fair share from the environment.
Fortunately, out of about 200 countries in the world, the countries that demand the extras only amount to about 50. The environment gets damaged even in poorer countries because the people use it just to stay alive. They cut trees for fuel and farm the soil heavily. It costs money to keep the environment clean.