Elon Musk (technology multi-billionaire) (2021): “My top recommendation honestly would be just to have a carbon tax. Because we’re not paying for the CO2 capacity of the oceans and atmosphere, we have what in economics is called an unpriced externality. The market is unable to respond to an unpriced externality. If we just put a price on it, the market will react in a sensible way… I talked to the Biden administration, the incoming administration, and they were like, ‘Well, this seems too politically difficult”… [ remembers thinking]“That’s at least half the reason you got elected, so why don’t you just fight for that?”” (Sean O’Kane, “Elon Musk says the Biden Administration shot down his carbon tax pitch”, The Verge, 12 February 2021: https://www.theverge.com/2021/2/12/22280410/elon-musk-joe-biden-carbon-tax ).