Photo taken on July 11, 2017 shows the release of the International Energy Agency (IEA)'s World Energy Investment 2017 Report during the World Petroleum Congress in Istanbul, Turkey. 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)
