Despite claims made by environmentalists and the Obama administration, a study released Thursday suggests the record-high drought that ravaged agricultural production across the Great Plains region last year was not caused by manmade global warming.

“The Central Great Plains drought during May-August of 2012 resulted mostly from natural variations in weather,” read a report by the National Oceanic and Atmospheric Administration’s drought unit.

“Neither ocean states nor human-induced climate change, factors that can provide long-lead predictability, appeared to play significant roles in causing severe rainfall deficits over the major corn producing regions of central Great Plains.”