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Maybe it's time to stop burning food as fuel. What are the jets going to do anyway, bomb Iranian children?

Remember when George W Bush signed into law the corn ethanol bill. Corn tripled in price within 8 years. Fuel didn't get cheaper. In fact it cost more to produce the ethanol.

Ethanol was always a political thing, and not technical. It was passed because it would triple the price of corn.

Not just corn. Farmers would grow more corn in place of other plants reducing the supply, and shorter supply generally means higher prices, This is happening in India right now.

Fair play, also we need to stop using palm oil in food.

But how else am I going get orangutan flavour in my ice c̶r̶e̶a̶m̶ confection?

All water under the bridge. Ethanol is now a paying proposition. And it uses corn we used to dump.

Maybe they should have said something like "These are solvable backwards compatibility issues, but not in the short or medium term."

Aviation is notorious for having long product cycles. Look at how long GA pilots have been spraying their communities with lead.

There's simply no economic feasibility to replace every seal on every aircraft.