Or perhaps we could allow obtaining of some carbon credits through carbon capture / sequestration, and tighten the emissions cap. For 4% of global GDP you could stop/compensate global co2 emissions based on current carbon capture technology's prices per ton of co2 removed. [1] If there were a business case for CCS, the cost would come further down. Currently there is no profit in it.
One would need to restrict the allowed methods to safe and scalable ones (like extraction from seawater, not ocean seeding).
One would need to restrict the allowed methods to safe and scalable ones (like extraction from seawater, not ocean seeding).
[1] https://m.youtube.com/watch?v=GmWpFCjh0Fk for prices and methods + https://www.mcc-berlin.net/fileadmin/data/clock/carbon_clock... + simplistic back of envelope calculation (assumes cost scales up linearly)