Scarcity arguments have always been the domain of fear mongers. A much more concrete problem is the environmental impact of resource availability, the opposite

Scarcity arguments have always been the domain of fear mongers. A much more concrete problem is the environmental impact of resource availability, the opposite of what you are saying. As the world gets richer, we will succeed at providing material wealth to the growing population... But at what cost? It is desirable to limit population growth nonetheless, and I think this will happen naturally, although possibly not soon enough. I don't have any magic bullet for reducing population growth; helping the poor get wealthier and more educated faster should help bring birth rates to just below the 2.1 children per couple (replacement rate) and get us to a soft landing.