{"id":180211,"date":"2016-12-12T15:56:50","date_gmt":"2016-12-12T14:56:50","guid":{"rendered":"http:\/\/hudo.com\/si\/?p=180211"},"modified":"2016-12-12T15:56:50","modified_gmt":"2016-12-12T14:56:50","slug":"takoj-nehajmo-jesti-krave-piti-mleko","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/aktualno\/takoj-nehajmo-jesti-krave-piti-mleko\/","title":{"rendered":"TAKOJ nehajmo jesti krave in piti mleko"},"content":{"rendered":"

Koncentracije metana (CH4) v ozra\u010dju je po obdobju relativne stagnacije v za\u010detku zadnjega tiso\u010dletja ob\u010dutno porasla. Zaradi hitrosti nara\u0161\u010danja tega toplogrednega plina v ozra\u010dju so znanstveniki izrazili zaskrbljenost, to vpra\u0161anje pa bo tudi glavna tema zasedanja Ameri\u0161ke geofizi\u010dne unije (AGU) ta teden v San Franciscu.<\/p><\/blockquote>\n

Metan je kemi\u010dna spojina, ki je manj\u0161a od ogljikovega dioksida, a ima ve\u010dji toplogredni u\u010dinek. Znanstveniki opozarjajo, da bodo prizadevanja v boju proti podnebnim spremembam spodkopana, \u010de ne bo tudi metan dele\u017een stro\u017ejega nadzora, na spletu pi\u0161e britanski BBC.<\/p>\n

Raje kot avtomobilu se odpovejmo govedini<\/h2>\n

Po besedah Roberta Jacksona z ameri\u0161ke univerze Stanford glavna tar\u010da ostaja CO2, kar je prav. A po njegovem mnenju bi morali upo\u0161tevati tudi metan, saj bi sicer lahko ta stopil na mesto zmanj\u0161anih ravni ogljikovega dioksida.<\/p>\n

Metan bo ena glavnih tem zasedanja Ameri\u0161ke geofizi\u010dne unije v San Franciscu, ki se je bo udele\u017eil tudi Jackson. Skupaj s kolegi, s katerimi sodeluje pri pobudi Globalni oglji\u010dni projekt, pa je tudi spisal uvodnik za znanstveno publikacijo Pisma o raziskavah okolja. To besedilo se obra\u010da na znanstveno skupnost in jo poziva, naj se loti pomanjkljivega znanja okoli CH4.<\/p>\n

Za zdaj sicer ni jasno, zakaj je naenkrat pri\u0161lo do tak\u0161nega pove\u010danja metana v ozra\u010dju. Med letoma 2000 in 2006 se je njegova koncentracija komaj kaj spreminjala, nato pa je v letu 2007 porasla, v letih 2014 in 2015 pa ob\u010dutno posko\u010dila – za ve\u010d kot 10 delcev ali ve\u010d na milijardo letno (ppb). Trenutno njegova koncentracija zna\u0161a 1830 ppb. Ppb je enota za zelo nizke koncentracije, ki nam pove, kak\u0161en je dele\u017e dolo\u010dene snovi v drugi.<\/p>\n

“Metan ima \u0161tevilne vire, a glavni razlog za njegov strm porast je verjetno kmetijstvo,” je za BBC ocenil Jackson. “V zadnjem desetletju smo bili pri\u010da nekoliko povi\u0161anim izpustom plinov iz goriv, a menimo, da so najverjetnej\u0161i razlogi biolo\u0161ki in tropski viri,” je dodal. Med kmetijskimi viri metana so govedo in drugi pre\u017evekovalci, pa tudi ri\u017eeva polja.<\/p>\n

V tej zgodbi skoraj zagotovo pomembno vlogo igrajo tudi mokri\u0161\u010da, a na porast koncentracij CH4 bi lahko vplivale tudi kemi\u010dne reakcije, ki obi\u010dajno ta plin odstranijo iz atmosfere. V ozra\u010dju bi se namre\u010d lahko spreminjale koncentracije dolo\u010denih kemi\u010dnih spojin, ki sodelujejo pri uni\u010denju metana.<\/p>\n

Kot je \u0161e pojasnil Jackson, je metan te\u017eje preu\u010devati kot ogljikov dioksid, ker je bolj difuzen. “A mislim, da bomo v prihodnjih nekaj letih dosegli res dober napredek,” je dodal Jackson.<\/p>\n

Medtem so se izpusti ogljikovega dioksida nekako umirili, kar daje upanje, da bi se morda lahko nara\u0161\u010danje njihove koncentracije v ozra\u010dju upo\u010dasnilo. Trenutno zna\u0161a dele\u017e CO2 v ozra\u010dju 400 ppb.<\/p>\n","protected":false},"excerpt":{"rendered":"

Industrijska vzreja goveda je za okolje bolj \u0161kodljiva kot ve\u010dina drugih onesna\u017eevalcev. <\/p>\n","protected":false},"author":7,"featured_media":180212,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1179],"tags":[2171,5944,3214,1645],"source":[4511],"supertag":[],"acf":[],"yoast_head":"\nTAKOJ nehajmo jesti krave in piti mleko - Hudo Slovenija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hudo.com\/si\/aktualno\/takoj-nehajmo-jesti-krave-piti-mleko\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TAKOJ nehajmo jesti krave in piti mleko - Hudo Slovenija\" \/>\n<meta property=\"og:description\" content=\"Industrijska vzreja goveda je za okolje bolj \u0161kodljiva kot ve\u010dina drugih onesna\u017eevalcev.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hudo.com\/si\/aktualno\/takoj-nehajmo-jesti-krave-piti-mleko\/\" \/>\n<meta property=\"og:site_name\" content=\"Hudo Slovenija\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hudo.si\" \/>\n<meta property=\"article:published_time\" content=\"2016-12-12T14:56:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hudo.com\/si\/wp-content\/uploads\/sites\/2\/2016\/12\/profimedia-0308116623.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1250\" \/>\n\t<meta property=\"og:image:height\" content=\"613\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"A. 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