Fascinating little tidbit: the EPA estimated the implementation cost of the Clean Air Act from 1970 to 1990 as costing about $523 billion 1990 dollars. That's about 1% of US GDP over the same period.
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The key insight that most people seem to be missing is that $100/tCO2 DAC puts an upper bound of about $1/gallon of gasoline/kerosene/diesel on what it’ll cost to fully decarbonize and get to net zero CO2 emissions, even w/o new tech for aviation, steel, cement, agriculture, etc.
Yeah. It's interesting to think about other options at prices below that. Nearing $1/t it starts to make sense for single affected countries (say the Netherlands or some consortium) to consider just paying for a solution outright. Like a defense budget, but for water.
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The budget for water infrastructure in the Netherlands, Venice, New Orleans etc already runs into the billions I believe.
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One close analogy might be ocean alkalization / alkalinization, which could allow countries like Australia to protect the alkalinity of waters around important reefs while permanently sequestering CO2. But apparently that was outside the scope of this document.
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