Its not that they dont understand, they dont even think about it. Even Hans Rosling from the clip above spends whole 3 seconds on the subject of energy needed t

Its not that they dont understand, they dont even think about it. Even Hans Rosling from the clip above spends whole 3 seconds on the subject of energy needed to support 20 Billion people living at the same comfortable level as top billion people today in developed countries. I seem to remember some funny back of envelope calculations that put energy needs of earth in 100 years (assuming current growth) at _full output_ of our sun.