Sure it is. It's only unsustainable if you restrict the population to a limited area (ie - Earth)
There may come a time when we don't NEED a larger population to support increasing specialization, but until then a broader population base is needed to foster growth in technology.
Not to mention that those 'one in a billion' history changing genius happen in larger numbers when we have more billions...
There may come a time when we don't NEED a larger population to support increasing specialization, but until then a broader population base is needed to foster growth in technology.
Not to mention that those 'one in a billion' history changing genius happen in larger numbers when we have more billions...