This paper describes two kinds of renewable energy: photovoltaic (PV) solar energy installations connected to the Italian electrical grid system, and pure biodiesel (BD100) production by using sunflower oil. A comparison between them is proposed on the basis of: (A) greenhouse gas emissions (GHG) and (B) land requirement. Point (A) is related to the emissions from carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O) deriving from energy production and use, which are calculated in terms of CO 2 equivalent by their global warming potentials (GWP); point (B) is related to the area (hectares of biomass plantations and m 2 of photovoltaic panels) necessary for energy production. The results will be compared to those resulting from the use of fossil fuels.
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