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How might we reduce oceanic CO2 levels?

Eric Wilmot's article "How to Design for a Post-Consumption Economy" gave several insights that tie many global issues together to the possible source of the problem we should prioritize and solve first: Create floating phytoplankton flotillas/farms.

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I once was told, "If you want to solve a problem, you must first go to the root of it." It seems planting these flotilla's to regenerate the bottom of the oceanic food chain (phytoplankton) can help solve numerous global survival issues:

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Similar idea for kelp farms (macroalgae) Kelp is mostly fructose, which is great for producing huge amounts of fuel ethanol.