Final answer:
The book 'Biofuels in Brazil' primarily examines the environmental impact of biofuels, including their production and sustainability in Brazil, and how they intersect with renewable energy and agricultural practices.
Step-by-step explanation:
The book 'Biofuels in Brazil' by Nogeuira and Capaz covers multiple aspects of biofuels and their development, usage, and impact in Brazil. However, based on the chapter contents provided, the most fitting description of the book's topic would be the environmental impact of biofuels. It discusses issues such as the competition between biofuel cultivation and food production, the emission of greenhouse gases, deforestation, and sustainability in the context of renewable energy sources and agricultural practices in Brazil. Moreover, it touches on the Energy Return on Energy Invested (EROEI) of biofuels, and the low-tech nature of biomass burning, alongside the challenges of scaling biofuel production to meet energy demands.