Fig. 1From: Genetic engineering of non-native hosts for 1-butanol production and its challenges: a reviewa Comparison of CO2 emission from different fuels (gasoline, butanol, and ethanol) [5]. b Total biofuels production by fuel type around the globe [6]. c Fluctuation in the crude oil prices from 2009 to 2018 [10]. d World energy consumption by different sources [12]Back to article page