Between World War II and the early 1960's in the U.S. the highest marginal personal income tax rate was at least 90% on (taxable--after deductions) income equivalent to at most $3,000,000 today. We should go back to that tax structure, investing the 'windfall' in mitigating climate change, starting with completely getting away from fossil fuels in ten years, at the most.

Once we have saved civilization we can start to worry about public debt. Putting the latter ahead of the former makes about as much sense as a turd in a urinal--and as everybody who has seen such a thing knows, 'that don't make no damn sense'.