At the rate were 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, its 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 cant keep up with us and our habit of wastage is not helping.
What do you mean by that? How could we possibly use the available resources of 1.5 earths? Is that not physically impossible? I don't think you can use more resources than exist. I think one of our biggest problems is that we don't actually know how many resources are available. Capitalism requires scarcity to work. It it is in private companies' best interest to make people think that their product is scarce. Then they can charge more.