Which characteristic defines sustainable energy?

The characteristic that defines sustainable energy is primarily centered on its reliance on renewable sources and the necessary infrastructure to support its production and distribution. Sustainable energy is derived from resources that are naturally replenished, such as solar, wind, hydroelectric, and geothermal energy. These sources contribute to a reduced environmental impact when compared to traditional fossil fuels.

The mention of strong infrastructure is also crucial because to effectively harness and utilize renewable energy, robust systems for energy production, storage, and distribution must be in place. This ensures that energy can be generated when available and delivered to users reliably. The infrastructure supports not just the generation of energy but also its integration into existing grids and consumption systems, making it essential for sustainable energy viability.

While other choices mention aspects like availability during the day or affordability for developed nations, these do not accurately capture the holistic definition of sustainable energy. Sustainable energy must be accessible to all and function continuously, not limited by time of day, nor should it depend on non-renewable sources. It must also be affordable and accessible in a way that can empower developing economies alongside developed ones. Thus, the emphasis on renewable sources and infrastructure clearly defines sustainable energy.