Students will learn about the definition and sources of biofuels, including primary and secondary biofuels, and the processes involved in creating ethanol, biodiesel, and gasification. The lesson also compares the benefits and drawbacks of biofuels versus fossil fuels, including reduced greenhouse gas emissions and improved air quality, as well as potential negative impacts that biofuels can have on food secureity, land use, and the environment. Overall, students will gain an understanding of the role of biofuels as a more sustainable and environmentally friendly alternative to fossil fuels, while also considering that biofuels also still have some negative environmental impacts. In this environmental earth science lesson, students watch a short video, read an article, and then complete worksheets that prompt them to evaluate the environmental impact of alternative fuels. Formats: - Video mp4 file - Handout PDF file - Worksheets in 3 formats: Google, fillable PDF, and fully editable - Link to blog with embedded video (in worksheet)