[sky-kedge0749]

There are no viable replacements for fossil fuels for a tremendous number of uses. There is currently no plausible way that, for example, long-distance flights could run entirely off solar.

Your economic analysis of

> Oil is still used all over the place because it's cheaper than the alternative.

has no contradiction with prices skyrocketing. Fossil gasoline might get to $20/ or $50/gallon before it's more expensive than the alternative, and so on for everything else.

"Somewhat more expensive" fertilizer means more expensive food, which means starving people, which is horrible on its own, but which could also create a very dangerous political situation.

Also the risk isn't that we'll run out of fossil fuels, it's that continuing to use fossil fuels would cause so much environmental damage that restricting the supply, as horrible as that would be, would be better than the alternative.

[colechristensen]

Viable non-fossil replacement for jet fuel: synthetic kerosene made from various biological sources. Approved for 50% blend on commercial aircraft, some older things depend on fossil components but a very fixable problem if it came to it.

https://aviationbenefits.org/environmental-efficiency/climat...

These guys claim an estimate of $3-4 per gallon (pre-tax and pre-distribution) for synthetic gasoline. Not 20 or $50 per gallon. https://carbonengineering.com/air-to-fuels/

> "Somewhat more expensive" fertilizer means more expensive food, which means starving people, which is horrible on its own, but which could also create a very dangerous political situation.

It really is only somewhat more expensive. Because of natural gas nonsense, the price of nitrogen fertilizer tripled ( https://www.dtnpf.com/agriculture/web/ag/crops/article/2022/... ) and is still getting used, we're talking about a moderate increase in price to switch from methane hydrogen in the amonia-from-air process to electrolyzed water sourced hydrogen.

Lots of nonsense based fearmongering goes around, the actual solutions are sure to exist and don't involve doomsday, but moderate price increases (and probably once they scale, price reductions)

[sky-kedge0749]

A problem with biofuel is scaling it up, see: https://ieeexplore.ieee.org/document/7498153. According to that article the U.S. would need to devote "an area bigger than Texas and California and Pennsylvania combined" to crops specifically for its own jet biofuel needs. That's just for flying, not for food or fuel for ground transportation or anything else.

Your gasoline link talks about 2050. Gas is averaging $5/gallon in the U.S. Where's this $3-4/gallon gas? And that $5/gallon price is aggressively cheap, Biden couldn't even get a tiny carbon tax through a government his own party controlled. I made up $20 and $50 but what do you think a fair price is if we price in environmental externalities? What would that price be between now and 2050?

By "natural gas nonsense" I assume you mean supply issues related to the war in Ukraine. That disruption is exactly the sort of problem we can expect more of going forward, or do you think it's some kind of one-off aberration? Also from https://www.cnbc.com/2022/03/22/fertilizer-prices-are-at-rec...: "The impact, Barclays suggested, will be 'extremely asymmetrical' with most emerging market economies disproportionately affected by food and fertilizer supply risks."