^Houghton, Jhon Theodore; Callander, Bruce A.; Varney, Sheila K. (1992). Climate change 1992: the supplementary report to the IPCC scientific assessment. Cambridge University Press. {{cite book}}: |access-date= requires |url= (help)}}
^M. Vitousek, Peter (1994). "Beyond Global Warming: Ecology and Global Change". Ecology. 75. {{cite journal}}: |access-date= requires |url= (help)
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