Dr. Fatih Birol, the International Energy Agency (IEA)'s executive director, delivers a speech at a press conference of the release of IEA's World Energy Investment 2017 Report during the World Petroleum Congress in Istanbul, Turkey, on July 11, 2017. The global investment in energy fell by 12 percent in 2016, while spending on clean energy hit a record high, the International Energy Agency (IEA) said in its report at the 22nd World Petroleum Congress on Tuesday. (Xinhua/He Canling)
