But I am curious how you came up with 25 billion, more than double the UN estimate.
Things like education for girls and (surprisingly to me) access to television dramatically decrease fertility rates. The former is surely a good thing and the latter is inevitable.
As the world modernizes and people in third world countries increasingly adopt first world standards of living (which in my opinion is a good thing), it seems logical that they will consume more energy.
But first world energy consumption has been pretty flat over the last couple decades due to increased energy efficiency even as GDP as grown. And over the same time period renewable energy has been increasing exponentially while costs are dropping.
In short, I don’t believe the previous posters claims about huge population growth nor his claims about future petroleum usage. Neither seem remotely plausible.