Sustainable engineering is a type of engineering that focuses on protecting the environment. It looks for ways to design structures, systems, and products that help keep the environment healthy and natural resources available for future generations. For example, by using solar panels to generate electricity, there is less need to use fossil fuels, which can pollute the air. Sustainable engineering also uses materials that are better for the environment, such as recycled materials. This helps reduce the amount of waste that goes into landfills.