Observed Climate Change and the Negligible Global Effect of Greenhouse-gas Emission Limits in the State of Utah

By | March 2, 2015

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[Illustrations, footnotes and references available in PDF version]

In this report, we review the long-term climate history of Utah and find little in the way of evidence that the greenhouse gas build-up in the atmosphere has much altered Utah’s climate. While statewide average temperatures have generally appeared to have risen in Utah over the past 100 years, they have fallen during the past 15 years. Further, there is evidence that the state’s temperature record contains non-climatic influences—such as land use changes, instrument changes, and improper instrument siting—which together add a warming bias to the state’s long-term temperature history, making it seem like the temperature has been increasing more than it actually has been.