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* Bratcher and Giese [http://physics.ramapo.edu/downloads/drew/backup/home/drew/EARTICLES/papers/grl/2002GL015191.pdf] observed conditions that "could be an indication of a climate regime shift to pre-1976 conditions." Bratcher and Giese conclude: "The results presented here do not preclude the possibility that anthropogenic sources of greenhouse gases have contributed to global warming. However the results do indicate that the human forced portion of global warming may be less than previously described."
* The [[IPCC Fourth Assessment Report]] states that human actions are "very likely" the cause of most global warming, meaning a 90% or greater probability that more than 50% of observed warming is attributable to human actions.
* Henrik Svensmark at [[Danish National Space Center]] <ref>[http://www.journals.royalsoc.ac.uk/(23vr0d45z5lsv045bnqadb55)/app/home/contribution.asp?referrer=parent&backto=issue,5,19;journal,4,138;linkingpublicationresults,1:102023,1]</ref> contends that low-level clouds (which cool the Earth) are formed when cosmic rays come into the low atmosphere. <ref>[http://www.spacecenter.dk/research/sun-climate/the-sky-experiment-1]</ref> Previous research has demonstrated a reduction in cosmic rays between 1920 and 1980, when measurements were stopped.
== Detection and attribution ==
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