Ian seems in diversion mode. But since there is no data to suggest unrestrained population growth is a good idea (aside from human sense of self importance) and has offered no guesstimate how many people *should* occupy the planet, ~500 million it is.
You can't look at the huge numbers of farmland, then take more fore renewable energy, and the vast number of people, and believe for a second that we aren't extinguishing other species pell-mell.