Guests taste zero carbon coffee at a theme park of the Boao Forum for Asia (BFA) 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 Zhang Liyun/Xinhua]