El Nino is here. What could it mean for China?

Meteorologists have confirmed that an El Nino has formed in the tropical Pacific, and forecasts suggest it could intensify in the coming months. What is El Nino? Could a "super" El Nino be on the way? How might it shape global weather patterns, and what could it mean for China? Climate Watch host Zhao Ying speaks with Wang Chunzai, a researcher at South China Sea Institute of Oceanology, and Director of the State Key Laboratory of Tropical Oceanography.