[[File:Carbon cycle.jpg|thumb|upright=1.8|center| 快速循环贯穿生物圈,包括陆地、大气和海洋之间的交换。黄色数字表示每年的自然碳通量,以十亿吨(gigatons)为单位。红色数字表示人类的贡献,白色数字表示被储存的碳。<ref name="nasacc">{{cite web|last1=Riebeek|first1=Holli|title=The Carbon Cycle|url=http://earthobservatory.nasa.gov/Features/CarbonCycle/?src=eoa-features|website=Earth Observatory|publisher=NASA|access-date=5 April 2018|date=16 June 2011|archive-url=https://web.archive.org/web/20160305010126/http://earthobservatory.nasa.gov/Features/CarbonCycle/?src=eoa-features|archive-date=5 March 2016|url-status=live|df=dmy-all}}</ref>]] | [[File:Carbon cycle.jpg|thumb|upright=1.8|center| 快速循环贯穿生物圈,包括陆地、大气和海洋之间的交换。黄色数字表示每年的自然碳通量,以十亿吨(gigatons)为单位。红色数字表示人类的贡献,白色数字表示被储存的碳。<ref name="nasacc">{{cite web|last1=Riebeek|first1=Holli|title=The Carbon Cycle|url=http://earthobservatory.nasa.gov/Features/CarbonCycle/?src=eoa-features|website=Earth Observatory|publisher=NASA|access-date=5 April 2018|date=16 June 2011|archive-url=https://web.archive.org/web/20160305010126/http://earthobservatory.nasa.gov/Features/CarbonCycle/?src=eoa-features|archive-date=5 March 2016|url-status=live|df=dmy-all}}</ref>]] |