IMO liquid or solid fuel at normal pressure and temperature is much cheaper and easier and safer to store than hydrogen.

Besides:

http://carbonengineering.com

http://www.climeworks.com

From https://lustysociety.org/ethics.html#climate:

Annual global fossil fuel subsidies amounting to $5.3 trillion in 2015 (6.5% of global GDP).

https://www.sciencedirect.com/science/article/pii/S0305750X1...

According to the Global Carbon Atlas: 36 183 million metric tons of CO2 emissions in 2016.

According to estimates in 2018 by Carbon Engineering and Climeworks: The cost of capturing 1 metric ton CO2 from the air costs $ 600 in 2018 and could fall under $ 100 in 5 - 10 years. A plant could make a liter fuel for a dollar.

At a cost of $ 600 per metric ton of CO2, the capture of the emissions of 2016 (36 183 million metric tons) costs $ 21 710 billion or $ 21.7 trillion.

At a cost of $ 100 per metric ton of CO2, the capture of the emissions of 2016 (36 183 million metric tons) costs $ 3 618 billion or $ 3.6 trillion.

The organic fuel should be used with batteries and fuel cells and not with combustion engines.

In order to decrease the CO2 concentration in the environment, the waste products must be contained and recycled later without release into the atmosphere.

PV is growing at 30-40% per year for many years now. This year’s end-of-year forecast is 0.5 TW, extrapolating that trend gives 11.5-28.3 TW in December 2030.

Hydrogen may be more energetic than a lot of stuff per unit of mass, but we shouldn't forget the tanks we need to carry it around are anything but light.