We need consumption to support people, yes, but Economic expansion and increasing consumption can't go on infinitely.
Most people shouldn't be able to afford a car - they should be taking public transit - but they can obtain one because they take out loans.
The american fracking industry shouldn't exist, but it can because it has access to cheap, infinite lines of credit.
Our health suffers for it.
So many people and businesses are able to live beyond their means because of access to credit. If we eliminate the ability to create credit, then consumption would drop to a sustainable level and pollution would also drop and we would see an end to wasteful businesses, products, processes, and ways of life.