In this Monday, June 29, 2020 a man wearing a face mask to protect against coronavirus, walks past a hair product billboard on the street in Soweto, Johannesburg, South Africa. Africa now has more than a half-million confirmed coronavirus cases as the continent-wide total is now over 508,000 after South Africa recorded another day of more than 10,000 confirmed cases as a new global hot spot. (Photo by Themba Hadebe/AP Photo/File)

Women quench their thirst with the tap water on a hot summer afternoon during heatwave in Prayagraj on June 10, 2024. India's heatwave is the longest ever to hit the country, the government's top weather expert said on June 10 as he warned people will face increasingly oppressive temperatures. Parts of northern India have been gripped by a heatwave since mid-May, with temperatures soaring over 45 degrees Celsius (113 degrees Fahrenheit). (Photo by Anil Shakya/AFP Photo)

A handout photo made available by Indonesia's Center for Volcanology and Geological Hazard Mitigation shows hot lava spewing from Mount Ibu in North Maluku province, Indonesia, 04 July 2024 (issued 05 July 2024). The Center for Volcanology and Geological Disaster Mitigation (PVMBG) advises the community around Mount Ibu and visitors not to carry out activities within a radius of 2.0 kilometers and a sectoral expansion of 5 kilometers towards the crater opening in the northern part of the active crater of Mount Ibu. (Photo by PVMBG/EPA)

A person dressed as the Statue of Liberty pays for a hot dog on a side street near the 51st Annual Village Halloween Parade in New York, New York, USA, 31 October 2024. The annual holiday parade passes through the city's Greenwich Village neighborhood and claims to be the largest Halloween parade in the world. (Photo by Justin Lane/EPA/EFE)

“Contrails (short for “condensation trails”) or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets or, if the air is cold enough, tiny ice crystals”. – Wikipedia

Photo: An airplane leaves a vapor trail as it flies in front of he moon on January 17, 2007 above Hanover, Germany. (Photo by Alexander Hassenstein/Getty Images)

A girl sticks out her tongue during snowfalls on a street in Hefei, Anhui province February 13, 2014. (Photo by Reuters/Stringer)

An internally displaced Afghan girl plays near their shelter at a refugee camp in Kabul January 13, 2015. (Photo by Omar Sobhani/Reuters)

A girl carries breads on her head as she walks in the snow, in Kabul, Afghanistan, Tuesday, February 8, 2022. (Photo by Hussein Malla/AP Photo)