Droughts result in crop failure and shortages of water. Nationwide fuel shortages and power outages resulted. The riots were triggered by economic problems, including food shortages and mass unemployment. It also suffered from some basic functional failures that brought economic bottlenecks, shortages, and inflation. Catastrophes cause deadly periods of great shortages. Many countries experience ongoing food shortages and distribution problems. This was due to shortages in fuel supply. He also anticipated modern concerns with fuel shortages and industrial pollution. Fishing was prohibited causing further supply shortages. The main problems were food shortages and rising prices. The pre-Columbian Americans often dealt with severe food shortages and famines. Dissatisfaction of proletarians was compounded by food shortages and military failures. "OHL" did nothing to mitigate the crisis of growing food shortages in Germany. Many countries are affected by power shortages. Recent government policies have led to problems with food shortages.