An exhibitor shows a system of digital technology-energy integration which could effectively use energy, in Boao, south China's Hainan Province, April 20, 2022. The BFA will hold its annual conference from April 20 to 22 in Boao, a coastal town in China's southernmost province of Hainan. Green recovery and sustainable development are among the topics of the conference. [Photo by Yang Guanyu/Xinhua]