Editing Cloud seeding (section)

==Methods==
===Salts===
[[File:Ground Based Silver Iodide Generator.jpg|thumb|Ground-based silver iodide generator – [[Colorado]], US ]]
The most common chemicals used for cloud seeding include [[silver iodide]],<ref>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/Silver-Iodide|title=Silver Iodide|access-date=2022-01-26|archive-date=2022-01-26|archive-url=https://web.archive.org/web/20220126213907/https://pubchem.ncbi.nlm.nih.gov/compound/Silver-Iodide|url-status=live}}</ref> [[potassium iodide]] and [[dry ice]] (solid carbon dioxide). [[Liquid propane]], which expands into a gas, has also been used. It can produce ice crystals at higher temperatures than silver iodide. After promising research, the use of [[hygroscopy|hygroscopic]] materials, such as [[table salt]], is becoming more popular.<ref>{{cite journal | last1 = Hill | first1 = S A. | last2 = Ming | first2 = Yi | year = 2012 | title = Nonlinear climate response to regional brightening of tropical marine stratocumulus | journal = Geophysical Research Letters | volume = 39 | issue = 15| page = L15707 | doi = 10.1029/2012GL052064 | bibcode=2012GeoRL..3915707H| s2cid = 128599895 | doi-access =  }}</ref>

When cloud seeding, increased snowfall takes place when temperatures within the clouds are between −20 and −7&nbsp;°C.<ref name=sac>{{cite news |first=Matt |last=Hill |title=Cloud seeding, no longer magical thinking, is poised for use this winter |url=http://www.sacbee.com/news/local/article2582373.html |work=Sacramento Bee |date=2013-11-11 |access-date=2020-01-28 |archive-date=2020-03-05 |archive-url=https://web.archive.org/web/20200305220724/https://www.sacbee.com/news/local/article2582373.html |url-status=live }}</ref> [[Freezing]] [[nucleation]] is induced by the introduction of substances similar to silver iodide, which has a [[crystalline]] structure like ice.<ref>{{Cite journal |last1=Vonnegut |first1=B. |last2=Chessin |first2=Henry |date=1971-11-26 |title=Ice Nucleation by Coprecipitated Silver Iodide and Silver Bromide |journal=Science |volume=174 |issue=4012 |pages=945–946 |bibcode=1971Sci...174..945V |doi=10.1126/science.174.4012.945 |issn=0036-8075 |pmid=17773193 |s2cid=37459080}}</ref>
===Electric charges===
Since 2021, the [[United Arab Emirates]] have been using drones equipped with a payload of electric-charge emission instruments and customized sensors that fly at low altitudes and deliver an electric charge to air molecules.<ref>{{cite web |title=UAE to test cloud-busting drones to boost rainfall |url=https://www.bbc.com/news/technology-56428984 |website=BBC |access-date=25 July 2021 |date=17 March 2021 |archive-date=24 July 2021 |archive-url=https://web.archive.org/web/20210724130730/https://www.bbc.com/news/technology-56428984 |url-status=live }}</ref> This method produced a significant rainstorm in July 2021.<ref>{{cite news |last1=Doliner |first1=Anabelle  |title=Dubai Creates Fake Rain Using Drones to Battle 122 Degree Heat |url=https://www.newsweek.com/dubai-creates-fake-rain-using-drones-battle-122-degree-heat-1611887 |access-date=25 July 2021 |agency=Newskeek |date=21 July 2021 |archive-date=24 July 2021 |archive-url=https://web.archive.org/web/20210724132553/https://www.newsweek.com/dubai-creates-fake-rain-using-drones-battle-122-degree-heat-1611887 |url-status=live }}</ref> For instance, in [[Al Ain]] it rained 6.9 millimeters on 20–21 July.<ref>{{cite web |title=Al Ain Historical Weather |url=https://www.worldweatheronline.com/lang/en/al-ain-weather-history/abu-dhabi/ae.aspx |website=World Weather |access-date=25 July 2021 |archive-date=25 July 2021 |archive-url=https://web.archive.org/web/20210725224859/https://www.worldweatheronline.com/lang/en/al-ain-weather-history/abu-dhabi/ae.aspx |url-status=live }}</ref>

===Infrared laser pulses===
{{Further|Laser-assisted water condensation}}
An electronic mechanism was tested in 2010, when [[infrared]] [[laser]] pulses were directed to the air above [[Berlin]] by researchers from the [[University of Geneva]].<ref name=ns>{{cite magazine|title=Laser creates clouds over Germany|url=https://www.newscientist.com/article/dn18848-laser-creates-clouds-over-germany.html|magazine=[[New Scientist]]|date=2010-05-02|access-date=2010-11-21|archive-date=2010-12-05|archive-url=https://web.archive.org/web/20101205211220/http://www.newscientist.com/article/dn18848-laser-creates-clouds-over-germany.html|url-status=live}}</ref> The experimenters posited that the pulses would encourage atmospheric [[sulfur dioxide]] and [[nitrogen dioxide]] to form particles that would then act as seeds.<ref name=ns/>