A couple walk in the Retiro park in Madrid on November 17, 2020 as a thick fog falls on the Spanish capital. (Photo by Gabriel Bouys/AFP Photo)

A Hot air balloon is seen at the Cup Hot Air event during the Air Sports festival titled “70 Years of Peaceful Sky” in Minsk, Belarus July 18, 2015. (Photo by Vasily Fedosenko/Reuters)

A fisherman boats in Chao Lake where thick cyanobacteria gather on the surface on August 5, 2015 in Chaohu, Anhui Province of China. As high temperature came in summar, part of water in Anhui Province's Chao Lake breeds large tracts of cyanobacteria which not only brought pollution to sense of smell, but also affected people's life. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)

The Sun rises above the forest near Kiskorpad, Hungary, 02 January 2021. (Photo by Gyorgy Varga/EPA/EFE)

A young festivalgoer jumps to burst a bubble at Latitude Festival at Henham Park, Britain, July 22, 2021. (Photo by Peter Cziborra/Reuters)

Women sells vegetables at Kaporo market in Conakry, Guinea Monday, September 13, 2021. (Photo by Sunday Alamba/AP Photo)

A cow is silhouetted grazing next the smoke of a chimney of an incineration plant in Lausanne at sunrise on November 19, 2021. (Photo by Fabrice Coffrini/AFP Photo)

In the mangrove swamps of Quang Lang in Vietnam fishermen use stilts to take them into the deeper water on December 18, 2021. (Photo by Bang Nguyen Trong/Solent News)