I didn't say modern agriculture requires fossil fuels, I said modern agriculture is dependent upon fossil fuels.

We can imagine a world with electric tractors, made with steel coked with biocarbon in solar-thermal furnaces, where the Haber process is run with hydrogen derived from clean electrolysis. But we don't inhabit that world at the moment.

That's a distinction that makes no difference. Agriculture uses only about 1% of our energy, so if we can move industrial society off fossil fuels, we can easily move farming off fossil fuels. Alluding to the specter of famine is just scaremongering.

And even at that, moving everything that is not agriculture off of fossil fuels still means a 99% reduction in fossil fuel use.

Then 100% when the solutions devised to get rid of the other 99% of use are adapted to agriculture and make the use there obsolete too.