Good water recycling systems (and desalination systems for those on the coast) combined with low cost and distributed synth bio based food production (i.e. precision fermentation, or biomass fermentation) could help relieve some of the strain on the food and water needs.
A second chance at Eden by Peter F Hamilton
N-O-D-E.net was really good but there's not been much on there recently (but still worth reading through if you've not come across it)
Oh wow how have I not heard of this before?! It looks incredible