Urban areas are commonly developed with inadequate planning, which can lead to communities settling in unstable locations, creating a need to either relocate these settlements to more appropriate places, or to stabilize the terrain. These actions must be combined with practices focused on reduction of environmental impacts, such as CO2 emissions. Therefore, this research aimed to compare the carbon footprint of reinforced soil structures to a conventional method. Two types of retaining wall using geogrid reinforcements were designed as an alternative to a cantilever wall made of reinforced concrete. After the design process, the volume of necessary material was estimated for each structure as well as the amount of CO2 emissions related to their production. The designed reinforced soil structures obtained a much smaller carbon footprint when compared to the reinforced concrete structure. Due to the increasing demand for terrain stabilization in urban areas, structures that are less impactful to the environment should be prioritized especially when they can also be used to promote vegetation growth. Thus, reinforced soil structures are a great alternative to common methods because of their smaller carbon footprint and they can also bring several benefits to the landscape, such as an increase in vegetated area.

This research aimed to analyze the degradation of the Vila Maria spring, located in the Magano neighborhood in the municipality of Garanhuns in the state of Pernambuco. The municipality's terrain is marked by undulated landform, especially hills, which allied to the accelerated rhythm of urban expansion without adequate planning, resulted in the occupation of risk areas such as slopes as well as environmental protection areas such as the adjacencies of springs. The analysis was carried out through a terrain modeling process in a geoprocessing environment and by data collected on visits to the study area. An analysis of the region's NDVI from years 2008 to 2018 was also performed. The analysis confirmed the Vila Maria spring's water degradation and found that it was aggravated by an inadequate disposal of rainwater through surface water drains which contributed to the intensification of erosive processes that generated a gully in the vicinity. The NDVI analysis found low average values with an increase from 2008 to 2018 during the wet season. This fact can be explained by the constant urban expansion which as has been utilizing slopes from the microbasin for the disposal of rainwater which allied to the constant flow of the Vila Maria spring, provides a constant supply of water to the vegetation cover. Moreover, it was possible to observe the misuse of the spring's water flow by the public administration which has most of its flow integrated to the surface water drainage system and it is disposed at the bottom of the slope going through a high risk of contamination.

O conteúdo desta obra, inclusive sua revisão ortográfica e gramatical, bem como os dados apresentados, é de responsabilidade de seus participantes, detentores dos Direitos Autorais.Esta obra foi publicada pela Editora Itacaiúnas em maio de 2020.

O presente artigo em forma de ensaio aborda os avanços, perspectivas e desafios da logística reversa do óleo lubrificante. O óleo lubrificante é um produto indispensável na área automotiva e industrial e seu consumo acarreta a geração de óleo lubrificante usado ou contaminado (OLUC). A gestão sustentável dos resíduos do OLUC torna-se um desafio à sociedade, pois não se limita apenas a aspectos ambientais, mas também sociais e econômicos. A Resolução Conama nº 362 de 2005 e a Lei Federal nº 12.305 de 2010 são as normativas mais relevantes que tratam sobre a obrigatoriedade da reciclagem do óleo usado. Nesse sentido, por meio de levantamento teórico sobre o tema, buscou-se identificar e discutir as principais barreiras enfrentadas no cenário brasileiro para reaproveitamento de seu resíduo pós-consumo. O estudo mostrou que fatores geográficos, fiscais, regulatórios e questões culturais interagem e contribuem para dificultar a ampliação da logística reversa no setor.

This research aimed to analyze the interaction between surface water drainage and the geomorphological risk in the urban area of Garanhuns, PE, Brazil. This region, driven by the national policy of coffee eradication, implemented in 1965 by the Brazilian Institute of Coffee – IBC, has maximized its urban occupation. This constant advance of the urban perimeter, combined with the geomorphological characteristics and the rainfall index that is atypical in this semiarid region, creates a scenario of high predisposition to geomorphological risks. The analysis was carried out by equating the existing interrelationships in the local landscape, based on a model of the geomorphological risk of the urban area, as well as photographs obtained on-site. The referred model was created through the application of the infinite slope theory, in order to determine the terrain’s stability. Based on the results, conclusions about the current situation of the urban occupation and drainage were inferred and a scenario of high geomorphological risk was found, originated by consequences of anthropic actions, driven by inadequate urban planning. Moreover, deficiencies were found in the urban drainage system, which aggravates the geomorphological risk in a considerable way since it amplifies the effects of erosion, allowing the occurrence of mass movements.