The death toll from floods in Nigeria this year has increased to 603 as local authorities race to get relief items to hundreds of thousands being evacuated from their submerged homes.

Monica Kariuki is about ready to give up on farming. What is driving her off her 10 acres of land outside Nairobi isn’t bad weather, pests or blight — the traditional agricultural curses — but fertilizer: It costs too much.

The Russian tanks and missiles besieging Ukraine also are threatening the food supply and livelihoods of people in Europe, Africa and Asia who rely on the vast, fertile farmlands of the Black Sea region — known as the “breadbasket of the world.”