Which is a major drawback to the use of ethanol-based energy?

A major drawback of ethanol-based energy is its impact on food prices and availability, as the production of ethanol often competes with food crops, leading to increased costs for staple foods. Additionally, the cultivation of crops for ethanol can result in environmental concerns, such as deforestation and loss of biodiversity. Furthermore, the energy return on investment for ethanol can be lower compared to fossil fuels, raising questions about its overall sustainability as a long-term energy solution.