What is the fine-grained topic of the following text: A report from the Famine Early Warning System shows that “north of Kayes and in some parts of the Mopti, Koulikoro, Ségou, and Timbuktu regions, rain shortages have affected crop development, which will likely reduce yields at these locations.” Hunger is a growing problem in Mali and aid is desperately needed. Only return the topic.
Crop failure and increasing hunger in Mali due to rain shortages