There have been responses to these criticisms, particularly in reference to Sovacool applying his methodology to nuclear power but using other researchers' results, from different methodologies, as the source of the above-tabled Wind and Solar energy figures. For example, Beerten and his colleague Daniel Nugent embarked on studying these other energy sources. Their paper reports that wind energy has a mean value of grams of CO 2 -eq/kWh and solar PV a mean value of grams of CO 2 -eq/kWh, with the minimum for wind being g and the maximum g and a minimum for Solar PV of 1 g and a maximum of 218 g. 
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