Carbon credits are useless for the same reason that non-proportional fines are also useless; for the incredibly wealthy the cost of speeding is the cost of the ticket. Some nations do a proportional speeding fine based on income - but that still doesn't affect the 1-0.1% whose wealth is more asset than income based.
That was effectively my point. There aren't appropriate dollar incentives to make the "market solution" work. It's really just a feel-good or virtue-signaling apparatus, not a financial market solution.
