What best defines renewable energy?

Renewable energy is best defined as energy generated from naturally replenished resources. This includes sources such as solar, wind, hydro, geothermal, and biomass. These energy sources are characterized by their ability to be regenerated naturally within a short time frame, making them sustainable and environmentally friendly options for meeting energy needs.

In contrast, energy derived from fossil fuels is a finite resource that contributes to environmental concerns such as greenhouse gas emissions and pollution. Energy consumed faster than it can be replenished refers to non-renewable resources, which cannot sustain long-term energy needs. Finally, while nuclear power is a low-emission energy source, it is not considered renewable because it relies on finite uranium resources and generates radioactive waste. Thus, the defining characteristic of renewable energy is its availability and sustainability through natural processes.