The article discusses different alternative fuels for transportation due to concerns about climate change and oil supplies. No single fuel has emerged as the best option yet. Some fuels can reduce oil use and greenhouse gases but are not ready for widespread use. Others are ready to go but don't offer much energy or environmental benefits. The future will likely involve a mix of biofuels, electricity, and hydrogen. However, each option is at a different stage of development and has its own pros and cons. There are many choices within the biofuels category alone.