We can come up with alternatives to fossil fuels.
Plastics are harder. But artificial photosynthesis might be the answer - anaerobic bacteria combined with nanotech. They aren't using it to make oxygen (this might seem handy for space travel, but it's better to grow plants as they also give you fresh food so you don't get scurvy) but polymers and the like. Complex molecules.
This might be a replacement system for converting oil into plastics - and also might be very useful on, say, Mars...if you only need sunlight and a few bacteria to make the plastic that you then feed to your 3D printer...
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