An interesting perspective but fundamentally wrong and trapped into the the growth thinking of the past two centuries. Do we really think the world needs more people? Do we understand the value of Canada's somewhat intact ecosystems to the world? Do we really think that 21st C NYC is more creative than Plato's Athens or Fujiwara Kyoto or China in the Tang dynasty? Population decline in a period of peace and prosperity, because of the peace and prosperity, is a very good thing for the world. It has never happened before and raises all sorts of new challenges. Most of our assumptions about how economies work will be wrong. We will need to find new ways to support welfare and prosperity. But this can be a wonderful opportunity. Read Shrinking Population Economics for a start.