There is no population limit. Haven't you heard of space colonies and their unlimited possibilities for expansion? Yep, that solution has been offered to me often curiously enough associated with a nuclear powered planet, the bottomless clean energy with the lowest footprint per gigabyte output.
As Monbiot points out it is an absurd science fiction account of the future, more finally to do with escapist religion and than offering any practical scientific possibilities.http://www.monbiot.com/2014/11/11/bette ... different/
“Space colonization is, at its core, a real estate business. … Those that colonize space will control vast lands, enormous amounts of electrical power, and nearly unlimited material resources. [This] will create wealth beyond our wildest imagination and wield power – hopefully for good rather than for ill.”(3) In other words, we would leave not only the Earth behind but also ourselves.
That’s a common characteristic of such fantasies: their lack of imagination. Wild flights of technological fancy are accompanied by a stolid incapacity to picture the inner life of those who might inhabit such systems. People who would consider the idea of living in the Gobi Desert intolerable – where, an estate agent might point out, there is oxygen, radiation-screening, atmospheric pressure and 1g of gravity – rhapsodise about living on Mars. People who imagine that human life on Earth will end because of power and greed and oppression imagine we will escape these forces in pressure vessels controlled by technicians, in which we would be trapped like tadpoles in a jamjar.
If space colonisation is impossible today, when Richard Branson, for all his billions, cannot even propel people safely past the atmosphere(4), how will it look in a world that has fallen so far into disaster that leaving it for a lifeless, airless lump of rock would be perceived as a good option? We’d be lucky in these circumstances to possess the wherewithal to make bricks.
Only by understanding this as a religious impulse can we avoid the conclusion that those who gleefully await this future are insane. Just as it is easier to pray for life after death than it is to confront oppression, this fantasy permits us to escape the complexities of life of Earth for a starlit wonderland beyond politics.