 This paper examines the environmental impact of four different types of solar panels, single-crystal silicon, SCC, multi-crystalline silicon, MCC, cadmium telluride, CDTE, and copper indium gallium disilenoid, CIGS. The authors found that the best performing type of panel was CDTE, which had the lowest energy payback times and global warming potential. Additionally, they found that one-axis tracking installations could increase the environmental performance of solar panels by about 10%. This article was authored by Enrique Lexicci, Marco Raghiai, and Vasilis Danakis.