Sustainable energy is characterized by which of the following?

Sustainable energy is characterized by its availability to all people, reflecting the principle that energy resources should be accessible and equitable for everyone, regardless of geographical or socio-economic barriers. This concept not only promotes fairness but also encourages inclusivity in energy utilization, ensuring that all communities can benefit from clean and renewable energy sources.

In contrast, the exclusive use of fossil fuels (as noted in option A) is inconsistent with sustainability, as fossil fuels contribute to environmental degradation and are finite resources. High emissions of greenhouse gases (option C) run counter to the principles of sustainable energy, which seeks to minimize environmental impact. Lastly, irregular supply sources (option D) do not align with the goals of sustainable energy systems, which aim for reliability and consistent availability of energy to support development and well-being.