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WikiPedia: Kitaran_karbon http://environment.nationalgeographic.com/environm... http://carboncycle.aos.wisc.edu http://www.carboscope.eu http://www.carboncyclescience.gov/ http://earthobservatory.nasa.gov/Features/CarbonCy... http://oco.jpl.nasa.gov/ http://www.esrl.noaa.gov/gmd/ccgg/index.html http://www.grida.no/climate/vital/13.htm http://www.carboschools.org //doi.org/10.1016%2Fj.agee.2004.01.040