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Taking into account the current relevance of the concept of smart city connected with the Internet of Things, this work aims to study the implementation of this concept by applying a new energy model in an existing public building. The purpose of this paper is to enhance the sustainability and energy autonomy of the building.

The building referred to in the case study is a library, and simulations related to the ongoing study are based on an energy audit, comprising a survey on electrical and thermal energy consumption. The innovative proposed model consists of a mix of energy production processes based on photovoltaic panels and biomass boilers. Economic analysis of the energy model has already yielded some results regarding the payback on investment, as well as avoided emissions in the context of development of a low-carbon economy with avoided emissions and socioeconomic advantages.

It is possible to enhance the sustainability of the library studied by the retrofit of the current energy system. With the integration of photovoltaic panels and the conversion or replacement of boilers from natural gas to biomass, the GHG emissions could drop around 121 t CO₂ per year. Another benefit would be the inclusion of endogenous resources over imported energy resources. The payback period for the measures proposed ranges from 2.5 to 8 years, proving that the increase in environmental sustainability is viable.

The intention here is to implement the concept of smart city, in more sustainable buildings, bringing them to the lowest possible energy consumption levels, hence increasing performance and comfort. Also, taking into account that the energy-consuming buildings are already constructed, it is urgent to reconvert them to lower the use of energy and emissions using technologies based on renewable energy, boosting the use of local resources.

The present study evaluates the principal forms of socioenvironmental damage suffered by local traditional populations and indigenous communities as a result of the installation and operation of the Pecém Industrial and Shipping Complex. The main problem being pollution in the municipalities of São Gonçalo do Amarante and Caucaia, which is in the Brazilian state of Ceará. As a theoretical framework, we use the concept of “environmental justice,” and “environmental racism.” The latter were used to understand the process of “deterritorialization” of these communities that resulted in extensive impacts on the natural environment, as well as the way of life and productive practices of these communities. Our analyses confirm the destruction of the means that allow noncapitalist exploitation of natural resources, such as artisanal fisheries, subsistence farming, and the use of commons. We show how all these processes are constitutive of environmental injustice and environmental racism. These may contribute to the organization of the resistance and struggle of the affected populations, namely indigenous peoples and traditional communities.