* Når [[solen]] skinner, udfører [[planter]] [[fotosyntese]], som binder kulstoffet i kuldioxid til [[kulhydrat]]er, og frigør [[ilt]] i processen. Denne proces er mest aktivt i relative nye [[skov]]e, hvor [[Træ (organisme)|trævæksten]] er hurtig.<ref>[http://www.sciencedaily.com/releases/2008/09/080910133934.htm Oregon State University (2008, September 10). Old Growth Forests Are Valuable Carbon Sinks. ScienceDaily. Retrieved September 10, 2008] Citat: "...unmanaged primary forests with large amounts of old growth, and that rather than being irrelevant to the Earth's carbon budget, they may account for as much as 10 percent of the global net uptake of carbon dioxide... The current data now makes it clear that carbon accumulation can continue in forests that are centuries old..."</ref><ref>[http://www.int.iol.co.za/index.php?set_id=1&click_id=31&art_id=vn20080805055219532C111356 August 05 2008, iol: Natural forests store three times more CO2] {{Webarchive|url=https://web.archive.org/web/20060615021453/http://www.int.iol.co.za/index.php?set_id=1 |date=15. juni 2006 }} Citat: "...Sydney – Untouched natural forests store three times more carbon dioxide than previously estimated and 60 percent more than plantation forests, said a new Australian study of "green carbon" and its role in climate change..."</ref> Samlet omdanner fotosyntesen på landjorden og i hydrosfæren i alt 100-115 GtC (gigaton kulstof) om året til biomasse.<ref name=behrenfeld98>{{cite journal | last=Field | first=C.B. | coauthors=Behrenfeld, M.J., Randerson, J.T.,Falkowski, P. | year=1998 | title=Primary production of the Biosphere: Integrating Terrestrial and Oceanic Components | journal=Science | volume=281 | pages=237–240 | doi=10.1126/science.281.5374.237 | pmid=9657713 | issue=5374 | bibcode = 1998Sci...281..237F }}</ref>
Klima Naturvidenskab