> The cost estimates seem to be 4-10 times as expensive as fossil fuels.
Importantly, this cost is expected to decrease precipitously as the cost of solar energy declines exponentially and as the the conversion technology continues to improve through iteration and economies of scale.
Also, over the next century the cost of fossil fuel extraction will increase and the price of synthetic and fossil fuels will get much closer at least.
If there was a tax reduction for carbon neutral fuels they could become cost competitive even more rapidly.
Kerosene for aviation and diesel for ships, trucks and mining are good candidates for synthetic fuels.
Importantly, this cost is expected to decrease precipitously as the cost of solar energy declines exponentially and as the the conversion technology continues to improve through iteration and economies of scale.