Great article David, renovation and refurbishment are only going to become more prevalent in coming years. I was trying to find the source of the building forecasts, and what they are based on - I suspect that once these forecasts are made they are self-fulfilling prophecies. However, it seems that if humanity is to survive, at some point we will need to cease all construction and redirect resources to regenerating the planet - likely well before 2050. Can you please link me to the sources for the building forecasts?