"C02 sequestration is cheap "

Well, no. It's a waste substance 2.7-3.2 times the mass of the fossil fuels we burn to produce it and much more diffuse as well. Capturing that, purifying it for liquification for transmission and sequestration isn't cheap.

https://cleantechnica.com/2024/01/30/ccs-redux-carbon-capture-is-expensive-because-physics/