A high-altitude balloon, which the US government has stated is Chinese, is seen as it continues its multiday path across the northern United States in Charlotte, North Carolina, US, 4 February 2023.

Source: https://www.dailymaverick.co.za/article/2023-02-07-balloon-recovery-begins-as-us-weighs-what-chinas-leaders-knew/

And a high-altitude balloon can, indeed, be used for surveillance.

Source: https://www.pakistantoday.com.pk/2023/02/22/the-balloon-that-blew-over-the-usa/

A Pentagon official stated the U.S. has “very high confidence” that the Chinese high-altitude balloon is flying over sensitive sites to collect information.

Source: https://thesource.com/2023/02/03/report-china-has-spy-balloon-the-size-of-three-buses-floating-over-western-u-s/?utm_source=rss&utm_medium=rss&utm_campaign=report-china-has-spy-balloon-the-size-of-three-buses-floating-over-western-u-s

A ‘Soul of Steel’ challenge will be launched in India in order to test one’s high-altitude endurance.

Source: https://www.thehindu.com/newsletter/the-morning-brew/here-are-the-latest-updates-and-the-big-news-stories-to-follow-today/article66376931.ece

China’s launch of a spy balloon on a high-altitude journey over the United States was unacceptable and irresponsible, he said, but he was postponing – not canceling – his visit.

Source: https://www.shorenewsnetwork.com/2023/02/12/analysis-after-spy-balloon-incident/

Chinese Foreign Ministry spokesperson Wang Wenbin told reporters Monday that the US has sent high-altitude balloons into its airspace more than 10 times since January 2022.

Source: https://www.independent.co.uk/news/world/americas/china-laser-green-hawaii-b2281250.html

Feb. 10, an F-22 fighter jet shot down an unmanned high-altitude cylindrical object the size of a small car, off the coast near Deadhorse, Alaska.

Source: https://www.ctvnews.ca/politics/some-sort-of-pattern-pm-trudeau-on-4-aerial-objects-downed-over-north-america-1.6271555

From hot, wet, tropical locations to dry, cold, high-altitude sites, Ausenco has designed efficient plants around the world and in the most challenging climates, including in the renowned Lithium Triangle.

Source: https://investingnews.com/alpha-lithium-appoints-ausenco-to-commence-pea-for-lithium-carbonate-plant-in-argentina/

Gasa is also renowned for its awe-inspiring mountain trails, including the famous Snowman trek, and high-altitude pathways that offer breathtaking vistas of glacial lakes.

Source: https://kuenselonline.com/laya-to-host-the-royal-highland-festival-next-month/

However, the characteristics of the lake-atmosphere interaction over the high-altitude lakes are still unclear.

Source: https://phys.org/news/2023-03-eight-year-dataset-reveal-lake-atmosphere-interaction.html

In this photo provided by the U.S. Navy, sailors assigned to Explosive Ordnance Disposal Group 2 recover a high-altitude surveillance balloon off the coast of Myrtle Beach, S.C., Feb. 5, 2023.

Source: https://www.postandcourier.com/ap/unidentified-object-downed-over-lake-huron-3rd-this-week/article_a571992a-ab1c-11ed-9c34-f37b77a9619e.html

No one gave a thought to the old world as sources of high-altitude danger.

Source: https://news.slashdot.org/story/23/02/12/2318206/us-military-shoots-down-fourth-flying-object-near-michigan?utm_source=rss1.0mainlinkanon&utm_medium=feed

On a recent, cold morning, Dr. Carlos Ortuño hopped into a tiny electric car to go check on a patient in the outskirts of Bolivia’s capital of La Paz, unsure if the vehicle would be able to handle the steep, winding streets of the high-altitude city.

Source: https://www.sandiegouniontribune.com/news/nation-world/story/2023-05-14/bolivian-ev-startup-hopes-tiny-car-will-make-it-big-in-lithium-rich-country

Southeast Alaska is a global hotspot for another type of landslide: those by thaw of high-altitude permafrost, melt of glaciers that buttress bases of mountains or a combination of those forces.

Source: https://alaskapublic.org/2023/11/29/deadly-wrangell-landslide-is-part-of-a-pattern-in-vulnerable-alaska-mountainous-terrain/

The Indian Army, responsible for safeguarding the border in the extremely high-altitude regions of the Himalayas, remains proactive in offering assistance to both tourists and the local population.

Source: https://voiceofsikkim.com/collective-helping-hand-pressed-for-rescuing-more-than-2000-tourists-in-sikkim/

The thin atmosphere surrounding Nepal's high-altitude airports and a speed miscalculation appear to have contributed to Sunday's air crash in Nepal which killed 68, with the fate of one Australian on board still unknown.

Source: https://www.dailymail.co.uk/news/article-11638195/Nepal-air-crash-Aviation-experts-theory-caused-plane-plunge-sky-killing-68.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

This is technically called clear air turbulence, and it's just when there are high-altitude jet streams and tunnels of air that are moving faster than their surroundings.

Source: https://www.discovermagazine.com/the-sciences/what-are-the-safest-seats-on-a-plane-and-13-other-airplane-safety-questions

US Navy personnel assigned to Assault Craft Unit 4 prepare material recovered in the Atlantic Ocean from the high-altitude Chinese balloon.

Source: https://nypost.com/2023/02/14/us-military-recovers-electronic-sensors-from-downed-chinese-spy-balloon/

When approaching the Pyrenees, the vegetation is a mixture of Mediterranean species and high-altitude trees.

Source: https://thepostnewspaper.net/2023/02/14/laissez-les-bons-moments-rouler-en-profitant-de-la-liberte-familiale-et-de-la-nature/

When most people consider the arctic, or high-altitude mountain landscapes, they think of endless snow, ice and bare rock.

Source: https://theconversation.com/tiny-but-tenacious-arctic-alpine-plants-are-engineers-and-warning-bells-204422