Sustainable energy refers to energy sources that are renewable and have a minimal impact on the environment. This includes resources like solar power, wind energy, and hydropower, which can be replenished naturally. By using these energy sources, we can reduce our reliance on fossil fuels, which contribute to pollution and climate change. The goal of sustainable energy is to provide power in a way that meets our current needs without compromising the ability of future generations to meet theirs. By investing in technologies like solar panels and wind turbines, we can create a cleaner, healthier planet for everyone.