The world was already producing less food this year even before the Ukraine/Russia war, which takes a ton of wheat-producing land out of service and has also greatly reduced the availability of chemical fertilizer, which will greatly reduce yields everywhere (including in the U.S., where there is a massive fertilizer shortage going on right now).

There's also a massive energy shortage, partially due to the Ukraine/Russia war (again, it was going to be a little bit bad and then the war made it tragic), which makes every part of the food supply chain tighter as well.