US Treasury Secretary Janet Yellen travelled from a small farm on a rural red clay road to a ramen noodle manufacturing plant in Zambias bustling capitol of Lusaka on Tuesday to showcase Africas potential to help solve the worlds problems with food shortages.Yellen, midway through a 10-day tour of Africa, devoted her day to highlighting the agricultural investment potential of underdeveloped African nations, especially as Russias invasion of Ukraine has exacerbated worldwide hunger and the cost of food.As we tackle acute needs now, we must also take a longer view and scale up investment in long-term food system resilience.