Why is the world's energy production a constant value from 2010 to 2040? Surely we produce more energy today than we did 30 years ago. Is this just a chart scale issue?
As pointed out by JosephRedfern, the production line is not exactly flat but has a very slight grade (http://i.imgur.com/oTUC2Nf.jpg). This means they postulate an increase in production.
That said I think this prediction is really insane and goes against common sense.