<human>:  What is the difference between renewable and non-renewable energy sources?
<bot>: The primary difference between renewable and non-renewable energy sources is that renewable energy sources are those that can be renewed or replenished over a relatively short period of time, while non-renewable energy sources are those that cannot be easily replenished and must be used sparingly. Examples of renewable energy sources include solar, wind, geothermal and hydro power. Examples of non-renewable energy sources include fossil fuels such as petroleum and natural gas.