the 2.5 % growth for 50 years amounts to a 3.4 fold increase in wealth for us. If the population does not increase, that means the 11-fold increase in the prior calculation (for others to catch up only to 2008 levels in the west) has to be multiplied by 3.4 to catch up to the west, plus another factor of 1.4 to account for the increased population.
As a consequence, the impact per unit of wealth has to decline by a factor of 11 * 3.4 * 1.4 = 52.9 .
In order to support business as usual without increasing net impact or abandoning any claim to international equity, impact per unit wealth has to decrease by more than a factor of fifty. Even that may not be sustainable: that is what is needed to fulfill the implicit promise of a growth economy to the rest of the world for another fifty years without increasing the RATE at which the earth is damaged. And even so, the growth idea implies continuing reduction in impact per unit of wealth thereafter.
It should not be assumed that it would be impossibly expensive to extract electricity from uranium and thorium. India is building a commercial fast breeder reactor that it expects to be finished by 2013. The technology has already been tested an earlier small prototype. The new Indian reactor will efficiently extract 100% of the energy from uranium at a cost of six and a half cents per kWh. Later serial produced Indian fast breeders are expected to produce electricity at a cost of four cents per kWh.
I have argued that Liquid Fluoride Thorium Reactors, capable of efficiently extracting 98% of the energy in Thorium, could be manufactured in factories at a cost as low as one dollar a watt of generating capacity. I might be wrong about this cost estimate, but so far no one had demonstrated that my estimate is impossible.
The ability to produce abundant, low costs energy is the key to maintaining human material well-being. When I was a young man, considerable concerned was expressed because human society faced a shortage of mercury. "How can human society survive, once the mercury runs out," people wondered. Yet substitutes were found. Mercury no longer goes into thermometers, but people still get their temperature checked.
The Indian government has already paid for the development of the fast breeder nuclear technology that will allow for low cost efficient conversion of uranium and thorium into electricity in India. The Indians estimate that building their fast breeder reactors will cost about $1.20 per watt of electrical generating capacity. This is almost half the capital cost of wind generators in the United States. If the Indians can build reliable post-carbon generating capacity at $1.20 per watt, a lot of electricity and energy intensive industries is going to relocate to India during the next 40 to 50 years. The same Indian technology that lowers power costs with use uranium and thorium several hundred time more efficiently, than uranium is used in current nuclear technology.

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