Biodiesel buses are public transportation vehicles that run on biodiesel, a renewable fuel made from vegetable oils, animal fats, or recycled cooking grease. This alternative fuel reduces greenhouse gas emissions compared to traditional diesel, making it a more environmentally friendly option for urban transit systems. Many cities are adopting biodiesel buses to promote sustainability and improve air quality. These buses can often use existing diesel engines with minimal modifications, allowing for a smoother transition to greener technologies. By utilizing biodiesel, cities can support local agriculture and reduce dependence on fossil fuels, contributing to a cleaner environment.