It is also about the energy we spend on cities. In a way, the sustainability of biofuels from agricultural crops (palm oil, sugar cane or maize) used in fossil fuels remains a very controversial issue. And the fact is that much of the energy consumed in developing countries (for cooking, heating or transport) can be attributed to forests in the form of charcoal, wood, residues, pellets, oils, sugars and starches and others. . . .