For more:
https://news.cgtn.com/news/2022-02-12/Meet-the-person-behind-the-eco-friendly-ice-17BdUR3YkHm/index.html

Athletes continue to give stunning performances in figure skating and speed skating at the 2022 Winter Olympics. It's made possible by the eco-friendly ice, the first in Winter Olympics history to use CO2 as a refrigerant. Peking University Professor Zhang Xinrong, the person behind the eco-friendly ice, told CGTN anchor Tian Wei that the trans-critical CO2 direct cooling system can simultaneously make the cold energy and thermal energy for humidification, and produce hot water for athletes.

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