A 3 % discount factor with an hypothesis of $ 250 bn annualy has in fact a $ 8 trillion dollar
policy cost (fared in todays dollar value) and not $ 20 trillion
over 87 years; (ii) I would assume, with great
certainty, that the cost of the
policy will not remain at $ 250 bn (in 2013 $) in the coming 87 years: government feed in tarifs and green certificate subsidies will become less and less expensive with renewable
energy prices matching fossil fuel
energy prices in the coming decades.