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 reason this is interesting: looking at the NAS's recent report on negative carbon emission technologies, many cost less than $20 per tonne of CO2 removed. The US produces ~5 Gt of CO2/yr. If the $20 was scalable, that would be well under 1% of GDP. ( https://www.nap.edu/catalog/25259/negative-emissions-technologies-and-reliable-sequestration-a-research-agenda … )
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Are tech solutions more likely to increase or decrease in cost over time?
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Most of the <~$20/tCO2 solutions have limited capacity (land constraints etc.). DAC is the major exception, which costs ~$100/tCO2 and has ~unlimited capacity and is instead limited by capex and energy costs, both of which will come down over time.https://twitter.com/scottleibrand/status/1095478861880389633?s=21 …
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