Agreed with WoF: You'd leave a generation gap and the entire world would have the same problem as China - Many old people and not enough young people to look after them. However in the long term that could only be a temporary problem which could be overcome if it meant the future survival of the species.
I've read in my uni books that say that we in the Western world would need two or more planets worth's of resources to live sustainably if we continue living as we are - Limiting the amount of births is one solution, but also we all have to change how we live and what we use.
But of course that won't happen until we're forced to do that - Likewise with births too. We'll continue what we're doing until we aren't physically able to anymore, simply because most of us aren't intelligent enough to know better and little green bits of paper with numbers written on them is more important than comfortable, happy lives and a sustainable future, apparently. I really do feel sorry for the next few generations.
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