AFP reported Californian-born Chinese Ailing Gu was planning to go for gold again on Sunday, but her freestyle slopestyle event was postponed until Monday due to weather.

In addition, the freestyle women’s aerials qualification round has been postponed, and the second training session for women’s abseiling in alpine skiing has been canceled.

Natural heavy snowfall and visibility problems are the cause for the delays in schedule. Environmentalists previously questioned the Beijing Winter Olympics for using all artificial snow.

Estonian Olympic biathlete Johanna Taliharm previously told the Associated Press that machine-made snow is “icier” and hence “faster and more dangerous.”

According to the IOC, Beijing was not using chemical additives in the snow-making process in the Winter Olympics. TechnoAlpin’s Area Manager for Asia, Michael Mayr, tells TIME that machine-generated snow is primarily made up of air and water, similar to real snow. 

Environmentalists argue that the Winter Olympics, held in an arid and water-scarce region like Beijing and using all artificial snow, will be harmful to the environment.

Additionally, China’s snow-making contractor, TechnoAlpin, told The Insider that the Games would require 343 million gallons of water to make snow. One in six central outdoor Olympic games, Zhangjiakou needs 192 million gallons of water. Based on the recommended water intake of six glasses per day, 343 million gallons of water is equivalent to a day’s drinking water supply for over 900 million people.

According to CEIC data, Beijing is a water-scarce region, with freshwater resources per capita of 36,000 gallons in 2017. Countries with less than 264,000 gallons of water per person are classified as water-scarce by the United Nations. Zhangjiakou, a city 110 miles from Beijing, is also one of the world’s most water-scarce regions.

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