Scientific American recently posted an article describing a new study that shows an increase in highly amplified jet stream patterns which can lock into place for long periods. This can lead to simultaneous droughts and associated food shortages in different parts of the world, especially important grain-producing areas. If this continues to occur, that would lead to increasing food shortages due to the droughts and more deaths due to the associated heat waves. You can read more about how these wave patterns set up in 2018 and how they relate to droughts and food production here.

Source: Climate Change Institute, University of Maine