Editor's notes: Beijing will become the first city to host both Summer and Winter Olympics. Beijing 2022 can set a new benchmark for a sustainable Olympic Games, on the one hand benefiting from the legacy of the Beijing 2008 Olympic Games and on the other developing a new winter sports destination in a sustainable way.
From Water Cube to Ice Cube
Beijing 2022 will use 26 competition and non-competition venues in three zones: downtown Beijing, the northwestern Yanqing district and co-host Zhangjiakou in North China's Hebei province, connected by a new high-speed railway to be completed by the end of 2019.
In the downtown zone, where all the ice-based sports will be held, 11 of 13 venues were used during the 2008 Summer Olympics.
The Water Cube, or the National Aquatic Center, a key legacy of the Beijing 2008 Summer Olympics, will be turned into a competition arena for curling during the 2022 Games.
The National Aquatics Center will be repurposed from Water Cube to Ice Cube with a transferable rink.
Renovations are expected to start at the Water Cube by the end of this year.
"It will take us about one month to complete the water-to-ice transformation, which will involve more than 20 specific steps," said Yang Qiyong, general manager of the National Aquatics Center Co.
After the Olympics, the curling tracks will be preserved as an Olympic legacy and open to the public.
From basketball to ice hockey
Ice hockey will be held in a converted arena in Wukesong that was used for the basketball competition in 2008.
As early as the initial construction of Wukesong Arena, ice hockey competition has been listed as one of the arena's future development directions.
Ice pipes were embedded in the floor when the arena was constructed. During the basketball competition, the rink was covered by a thick ice carapace to insulate the cold and new flooring was installed for basketball. The transition work can be finished in 8 hours.
The Wukesong Arena is not only used for basketball and ice hockey competition, but also as a stadium for concerts.
No alternative Bird's Nest
The National Stadium is known as the Bird's Nest and will host the opening and closing ceremonies of Beijing 2022.
The reuse of ready-made facilities to optimize savings in venue operation is expected to significantly cut the cost for Beijing.
"There is absolutely no doubt about Beijing 2022 being cost-effective," said Christophe Dubi, the IOC's executive director for Olympic Games.
According to Beijing's candidature file submitted to the IOC in 2015, the combined infrastructure and operational budgets for the 2022 Games total about $3.5 billion - significantly less than the cost of staging a Summer Olympics.
Ice Ribbon, a new legacy of Olympics
Sitting in the Olympic Forest Park next to the Beijing 2008 tennis facility, the National Speed Skating Oval, dubbed the "Ice Ribbon", began construction last April, with its main structure scheduled for completion this September, and is expected to be completed by the end of 2019.
The oval will cover 80,000 square meters and hold a capacity of 12,000 people. The oval will stage speed skating races at Beijing 2022.
Twenty-two separate light strands (or ribbons) flow up and around the oval, representing the speed and trail of this sport. At night, the facade will create an exciting spectacle, with each of the strands becoming dynamic ribbons of light, able to change to an endless array of lighting programs.
Its 12,000-square-meter ice-covered areas will enable it to become the largest skating facility in Asia.
The new speed skating oval will be able to serve amateur skaters in all seasons after 2022 with a 10,000-square-meter public rink, also a fitting addition to the architectural legacy of the Olympics.
Big air snowboarding in a former steel mill
Big air snowboarding , a new event added to the Pyeongchang Winter Games, also will be included in the 2022 Games.
A main structure of the big air facility in Beijing, standing 60 meters high and 160 meters long, will be built at the Shougang Industrial Park, which evolved from a former steel mill closed down in 2008 ahead of the Beijing Summer Olympics.
Construction on the project will begin in the second half of this year.
Against the backdrop of an industrial tower, Shijing Mountain and Yongding River, the big air snowboarding venue will become another Olympic landmark building in Beijing.
After the Games, the facility can still be used for competitions and training. It can also serve to promote ice and snow sports open to the public, which reflect the concept of sustainability and injects vigor into the region's development.