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There are still many naysayers of global warming, but they too know that natural resources are running out. We can solve many of the problems that will arise in the future if dedicated R&D was pooled into it from the world governments - food demand in line with population rises can be dealt with by growing food with artificial light (sounds bad, but the only difference is that they will be grown indoors as opposed to the lovely fresh air, where microbes and flies can gobble them up :-/); widely available oil will cease to exist as we approach 2100, making it a luxury good, but by then alternative energy sources and substances will be in wide use in cars, cosmetics, etc.
There will still be some things that cannot be resolved - natural minerals (e.g. lithium - used in batteries of all sorts will be fought over and used as a political card in the coming decades) and metal resources are finite, they can only go round so much. Unless the world governments can come to a compromise (of which some will undoubtedly lose out), we are going to see another world war.