This document discusses the causes and effects of droughts based on evidence from various sources. It identifies the main causes of droughts as lack of rain and high temperatures. The effects mentioned are migration, loss of homelands, and economic and agriculture problems. As an example, it discusses the Dust Bowl that occurred in the Great Plains. Prevention methods include storing water, watering plants/trees regularly, and protecting water resources. Maps and graphs are presented showing drought intensity in different years and locations around the world. The conclusion is that lack of rainfall over long periods of time leads to droughts, and that droughts could increase significantly over the next 100 years.