{"id":810,"date":"2020-11-25T16:17:31","date_gmt":"2020-11-25T16:17:31","guid":{"rendered":"http:\/\/www.ritosaurus.com\/?p=810"},"modified":"2020-11-26T06:55:43","modified_gmt":"2020-11-26T06:55:43","slug":"firewood","status":"publish","type":"post","link":"https:\/\/ritosaurus.com\/hr\/posts\/firewood\/","title":{"rendered":"Drvo za ogrjev"},"content":{"rendered":"
\"\"<\/figure><\/div>\n\n\n\n

Zamisli drvenu ku\u0107icu usred stare \u0161ume, u rukama vru\u0107i \u010daj ili kavu, toplu deku, prozor koji gleda na jezero, a u pe\u0107i na drva pucketavu vatru.<\/p>\n\n\n\n

Rijetko koji prizor mo\u017ee biti tako idili\u010dan.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Drvo za ogrjev koristi se diljem svijeta kao relativno jeftin i veoma efikasan na\u010din grijanja zatvorenih prostora.<\/p>\n\n\n\n

Neki radije biraju drvo nego fosilna goriva kao izvor topline jer ga smatraju prihvatljivijim za okoli\u0161.<\/p>\n\n\n\n

No, postavlja se pitanje je li drvna masa uglji\u010dno neutralna ili ne \u2013 prije svega, potrebno je objasniti \u0161to ozna\u010dava uglji\u010dna neutralnost<\/strong>. Uglji\u010dna neutralnost je ravnote\u017ea izme\u0111u emisije ugljika i njegove apsorpcije iz atmosfere u ponore ugljika. Ponor ugljika je svaki sustav koji apsorbira vi\u0161e ugljika nego \u0161to ga emitira. Glavni prirodni ponori su tlo, \u0161ume i oceani. Ovi ponori ugljika poma\u017eu u uklanjanju ugljika (ugljikov dioksid, CO2<\/sub>) iz atmosfere i time poma\u017eu u borbi protiv klimatskih promjena.<\/p>\n\n\n\n

Dakle, je li drvna masa uglji\u010dno neutralna? Stabla apsorbiraju ugljikov dioksid iz atmosfere. Ako jedno drvo iskoristimo za ogrjev, jednostavno je posaditi drugo drvo koje \u0107e apsorbirati ugljik iz atmosfere umjesto onog prethodnog, i lako je pretpostaviti da smo na jednoj mikrorazini postigli uglji\u010dnu neutralnost.<\/p>\n\n\n\n

No, naravno, nije tako jednostavno. Osim \u0161to sje\u010da drva smanjuje povr\u0161inu \u0161uma koje upijaju ugljikov dioksid, njihovo izgaranje trenuta\u010dno otpu\u0161ta novu emisiju ugljika; nasuprot tome, potrebno je znatno du\u017ee razdoblje, desetlje\u0107a ili \u010dak stolje\u0107a, da posa\u0111ena stabla narastu dovoljno da bi mogla apsorbirati koli\u010dinu ugljika koja se otpu\u0161ta izgaranjem.<\/p>\n\n\n\n

Drugim rije\u010dima, sije\u010demo \u0161ume koje bi apsorbirale ugljikov dioksid, a zatim izgaranjem drva omogu\u0107avamo novu emisiju ugljikovog dioksida.<\/p>\n\n\n\n

Drvna masa mo\u017eda bi se mogla smatrati uglji\u010dno neutralnom dugoro\u010dno gledano.<\/p>\n\n\n\n

Me\u0111utim, prema W. Schlesingeru s instituta Cary Institute of Ecosystem Studies (2018), \u010dak i ako se za svako posje\u010deno i spaljeno drvo posadi jedno novo stablo, trebalo bi izme\u0111u 40 i 100 godina da takva \u0161uma apsorbira jednaku koli\u010dinu ugljika kao prirodna \u0161uma. A s obzirom da ve\u0107ina posa\u0111enih \u0161uma bude posje\u010dena prije dosezanja starosti od 40 godina, mogu\u0107e je da nikad ne postignu uglji\u010dnu neutralnost.<\/p>\n\n\n\n

\u010cini se da drvna masa kao izvor topline ipak nije posve bezazlena \u2013 barem ne kratkoro\u010dno. Za dugoro\u010dno postizanje uglji\u010dne neutralnosti, potrebno je pove\u0107anje povr\u0161ine \u0161uma, ali i unapre\u0111enje upravljanja \u0161umama.<\/p>\n\n\n\n

Koji je izvor topline najmanje \u0161tetan za klimu? Mo\u017eda zasad nemamo jasan odgovor, no to ne zna\u010di da on ne postoji. Samo ga trebamo prona\u0107i.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n\n\n\n

Literatura<\/p>\n\n\n\n

Cary Institute of Ecosystem Studies. “Wood pellets: Renewable, but not carbon neutral: Turning forests into fuel comes at an environmental cost.” ScienceDaily. ScienceDaily, 22 March 2018.<\/p>\n\n\n\n

https:\/\/www.europarl.europa.eu\/news\/en\/headlines\/society\/20190926STO62270\/what-is-carbon-neutrality-and-how-can-it-be-achieved-by-2050<\/a><\/p>\n\n\n\n

https:\/\/www.smithsonianmag.com\/smart-news\/epa-declares-burning-wood-carbon-neutral-180968880\/<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Cozy, wooden little house in the middle of an old forest \u2013 imagine hot tea or coffee, soft blankets, a perfect lake view through the window, and fire crackling and sparking in the woodstove. It can hardly get more idyllic. The use of wood for heat is widely spread because it is a relatively cheap… Read More »Drvo za ogrjev<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":811,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"[\"title\",\"meta\",\"content\",\"comments\"]","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[9],"tags":[],"yoast_head":"\nFirewood - Ritosaurus<\/title>\n<meta name=\"description\" content=\"The use of wood for heat is widely spread because it is relatively cheap and quite efficient way of heating indoor space.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ritosaurus.com\/hr\/posts\/firewood\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Firewood - 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