The fact that so many countries (including Ukraine "the breadbasket of Europe") are considering grain export constraints is very worrying, but I was thinking more along the lines of

Monbiot.com: Goodbye, Kind World

We now know, for example, that the Himalayan glaciers which feed the Ganges, the Bramaputra, the Mekong, the Yangtze and the other great Asian rivers are likely to disappear within 40 years. If these rivers dry up during the irrigation season, then the rice production which currently feeds over one third of humanity collapses, and the world goes into net food deficit.

Oye, vatos, dees English sink todos mi ships, chinga sus madres, so escuche: el fleet es ahora refloated, OK? — The War Nerd