三年困难时期
By this time, however, it was too late. With no sparrows to eat them, locust populations ballooned, swarming the country and compounding the ecological problems already caused by the Great Leap Forward, including widespread deforestation and misuse of poisons and pesticides. Ecological imbalance is credited with exacerbating the Great Chinese Famine, in which 15–45 million people died of starvation. The Chinese government eventually resorted to importing 250,000 sparrows from the Soviet Union to replenish their population.