{"id":1000,"date":"2010-02-18T14:04:00","date_gmt":"2010-02-18T13:04:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_threat_of_melting_ice\/"},"modified":"2026-10-08T00:34:42","modified_gmt":"2026-10-07T22:34:42","slug":"the_threat_of_melting_ice","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_threat_of_melting_ice\/","title":{"rendered":"J\u00e4\u00e4tik\u00f6iden sulamisen uhka"},"content":{"rendered":"<div class=\"lede\">\n<p>Noin 20 000 vuotta sitten suuri osa Euroopasta, Aasiasta sek\u00e4 Pohjois- ja Etel\u00e4-Amerikasta oli peitetty valtavilla, useita kilometrej\u00e4 paksuilla j\u00e4\u00e4peitteill\u00e4. Siit\u00e4 l\u00e4htien j\u00e4\u00e4 on sulanut v\u00e4hitellen ja j\u00e4\u00e4peitteet ovat vet\u00e4ytyneet. Nyky\u00e4\u00e4n maapallon maamassoilla on j\u00e4\u00e4peitteit\u00e4 en\u00e4\u00e4 vain Antarktikalla ja Gr\u00f6nlannissa. J\u00e4\u00e4t\u00e4 esiintyy my\u00f6s vuoristoalueiden j\u00e4\u00e4tik\u00f6in\u00e4 sek\u00e4 kelluvina j\u00e4\u00e4lauttoina J\u00e4\u00e4merell\u00e4 ja Antarktiksen ymp\u00e4rill\u00e4.<\/p>\n<\/div>\n<p>Ensi silm\u00e4yksell\u00e4 n\u00e4m\u00e4 viimeisen j\u00e4\u00e4kauden kaukaiset j\u00e4\u00e4nteet eiv\u00e4t n\u00e4yt\u00e4 olevan kovin merkityksellisi\u00e4 useimmille meist\u00e4 nyky\u00e4\u00e4n. Mik\u00e4\u00e4n ei kuitenkaan voisi olla kauempana totuudesta. Monet tutkijat uskovat, ett\u00e4 maapallomme l\u00e4mpenee ilmakeh\u00e4\u00e4n p\u00e4\u00e4st\u00e4m\u00e4mme kasvihuonekaasujen seurauksena. Jos maapallo l\u00e4mpenee, j\u00e4\u00e4peitteet alkavat sulaa, mik\u00e4 nostaa merenpintaa ehk\u00e4 jopa useita metrej\u00e4 t\u00e4m\u00e4n vuosisadan loppuun menness\u00e4. T\u00e4llainen nousu aiheuttaisi laajoja tulvia matalilla rannikkoalueilla ja uhkaisi monia suuria kaupunkeja.<\/p>\n<p>Avaruudesta tehdyt havainnot viittaavat siihen, ett\u00e4 osat suurista j\u00e4\u00e4peitteist\u00e4 ovat alkaneet sulaa entist\u00e4 nopeammin. Samaan aikaan tuoreet satelliittikuvat ovat osoittaneet, ett\u00e4 poikkeuksellisen laajoja merij\u00e4\u00e4alueita on sulanut arktisen kes\u00e4n aikana. Vaikka merenpinnan korkeuteen ei ole vaikutusta kelluvan j\u00e4\u00e4n sulamisella, seurauksena on muita merkitt\u00e4vi\u00e4 ymp\u00e4rist\u00f6muutoksia. Esimerkiksi j\u00e4\u00e4peitteet toimivat peilin tavoin, heijastaen auringonvaloa ja viilent\u00e4en maapalloa. Jos j\u00e4\u00e4 katoaa, maapallo todenn\u00e4k\u00f6isesti l\u00e4mpenee ja suuria ilmastomuutoksia voi tapahtua. My\u00f6s polaarialueilla el\u00e4v\u00e4lle villiel\u00e4imist\u00f6lle voi koitua tuhoisia seurauksia.<\/p>","protected":false},"excerpt":{"rendered":"<p>About 20,000 years ago, much of Europe, Asia, North and South America was covered by huge sheets of ice, each many kilometres thick. Since then, the ice has gradually melted [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2009\/10\/iceberg2\/17899718-2-eng-GB\/Iceberg.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2009\/10\/Iceberg2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[64,42,10],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1000","post","type-post","status-publish","format-standard","hentry","category-climate-change","category-earth","category-learn","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1000","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=1000"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1000\/revisions"}],"predecessor-version":[{"id":2143,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1000\/revisions\/2143"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1000"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1000"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1000"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1000"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1000"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1000"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1000"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}