that fossil fuel consumption becomes a rounding error?). This is getting silly. If someone says "energy", it is unreasonable to pretend that only a few favorites of the total available should be counted. Certainly the economics of such energy is a different question of course, but no cost/supply curves for this "net energy decline" were provided or referred to. "Solar energy capacity of deserts. The largest accessible but least tapped form of energy on earth is solar radiation on deserts. Its capacity, i.e. the annually received amount can be estimated in a rather straight forward way, since radiation is quite uniform across the desert regions. The hot deserts cover around 36 Million km (UNEP, 2006) of the 149 Million km of the earths land surface. The solar energy arriving per 1 year on 1 km desert is on average 2.2 Terawatt hours (TWh), yielding 80 Mio Terawatt hours/year. This is a factor of 750 more than the fossil energy consumption of 2005, and there is still a factor of 250 if this demand would triple until 2050." Certainly their proposal for the MENA project, supplanting all Europe, North Africa and the Middle East's electricity generation with solar electricity from a patch of the Sahara about the size of a postage stamp on a full-page map of the Sahara as well as providing desalinated water for all the dry regions surrounding the Med, is accurately engineered, do-able with present technology, economically viable, has sufficiently high EROI, uses primarily glass and aluminum