The article reviews how computer models are used to study biofuels policies. These models help estimate the impact of biofuels on things like land use, greenhouse gas emissions, food prices, and the economy. They also look at how biofuels affect the livestock industry. Overall, the research suggests that mandating or subsidizing biofuels may not be the best option economically, but it doesn't consider the environmental benefits. The study points out that there is still a lot to learn about how biofuels policies affect different aspects of society.