A renewable energy engineer works on environmental projects to research and develop approaches to providing clean energy sources and green solutions for the world’s energy needs. Some work as consultants, while others have duties that involve designing machines and systems to capture and distribute renewable energy from wind, solar, and geothermal resources. As a renewable energy engineer, you can specialize in chemical, industrial, mechanical, or electrical engineering, but regardless of your specialty, you focus on sustainability and reducing the use of non-renewable products like oil as an energy source. Your goal is to limit the effects of fossil fuels on climate change and reduce the risk these energy sources pose to human health.