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S

solar energy

reaches the Earth in the form of solar radiation. The sun is currently considered to have the greatest fuel and energy potential. It can be processed in the photovoltaic, photothermal or photochemical conversion process. The advantages of solar energy include: the unlimited nature of its resources and its universality, thanks to which it is used almost everywhere on Earth. Solar energy is already the least expensive source of electricity accessible in several nations throughout the world

Shiradkar, N., R. Arya, A. Chaubal, K. Deshmukh, P. Ghosh, A. Kottantharayil, S. Kumar, and J. Vasi. 2022. Recent developments in solar manufacturing in India. Solar Compass 1:100009. doi:10.1016/j.solcom.2022.100009

sustainable transportation

refers to low- and zero-emission, energy-efficient, and affordable modes of transport, including electric and alternative-fuel vehicles, as well as domestic fuels. 

https://www.energy.gov/eere/sustainable-transportation-and-fuels