fusion power plants will probably be available in 10 years or sooner. ITER
http://www.iter.org/
although, population growth still needs control. china controlled it with an iron fist, so in a way, communism worked for china. even with such control, china is paying for that today, as well as the rest of the world pay for china. other places like India, there is no such control mechanism of any kind. the rest of the world, will pay for that for years to come.