Clean energy sources are forms of energy that produce little to no pollution and have a minimal impact on the environment. Examples include solar energy, which harnesses sunlight using panels, and wind energy, generated by wind turbines. These sources are renewable, meaning they can be replenished naturally and are sustainable over time. Other clean energy sources include hydropower, which uses flowing water to generate electricity, and geothermal energy, derived from the Earth's internal heat. By utilizing these clean energy sources, we can reduce our reliance on fossil fuels, lower greenhouse gas emissions, and combat climate change.