Mao Jietai of Peking University says circumstantial evidence suggests cloud seeding can increase precipitation by around 10%, but admits doubts about its real efficacy.

• 北京大学的毛节泰（音）称，有间接证据表明，"播云"可能提高大约10%25的降雨量，但他也不否认对其实际功效表示怀疑。