At the rate we’re going, we are already using up the available resources of 1 ½ Earths, even though this planet is all we have at the moment. Unless we can find another Earth where we can move half of our 7 billion population, it’s very obvious that we are using up our finite supply of resources. The effect of growing population will be an increased demand for resources and space. Both of which we are running out of. The Earth just can’t keep up with us and our habit of wastage is not helping.