This is a shot of New York in 1887.  What you see are electrical wires – and just electrical wires. If you are under 40, before you die you may very well see New York as a city with no overhead electrical wires at all. In a generation, our power grid will be solar via satellite. Every house will be wifi and those pesky computer/printer wires under your desk will be as gone as the dodo. But the problems we will still have will be recycling the water we have, the garbage we are producing and the air we have to breath.