What he said was that efficiency is not enough, there have to be absolute reductions in emissions. Take the IPCC projections. They assume 2% per year global economic growth over the next 100 years AND 2% per year improvement in efficiency at the same time to get growth despite peak oil. Like you they assume the economy will be more efficient in 20 years. This leads to the A1B1, 4-6.5 C warming "worst case scenario". Efficiency only helps if there is no fossil fuel based economic growth.
Kratax: 'Super powers' require super input of resources. An army doesn't work if the soldiers can't move or are hungry. I believe what's more expectable is the scene which occurred in Argentina some 11 years; Google and find the descriptions...
Good video, but really needs to be re-edited so that we can see the slides he refers to. They are available for download, but it would enhance the video so much more if they were interspersed with the narrative.
@PermaMax Right, but no one said you would have to wait until everything is scarce. Though, I kind of don't believe in wars, but if things go really restless, then there might fly scraps in the air anyway.