Edit: nearly forgot this - I would love to see some analysis on the net CO2 balance after covering the Atlantic in algae, then transporting it all into trenches

Edit: nearly forgot this - I would love to see some analysis on the net CO2 balance after covering the Atlantic in algae, then transporting it all into trenches and buying it. I also assume this will kill almost all other life in that ocean. If you are of the opinion that this action will save the rest of the world's wildlife, then I suppose it's a trade that can be made. The unsustainable part of modern life is not the fuel used, it's the sheer number of miles the average person travels, and the miles travelled by the items they purchase (and the number of those items). The modes of tranport you described are incredibly efficient, used properly. Just to pick one example, modern passenger jets get 80mpg+ per person. If you really have to fly a long way (for example, to a climate conference!) it's better to fly than to drive, unless you give a few other people a ride. You'll also need some fast way to ship your replacement protein, unless you are lucky enough to live in certain parts of the world.