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Researchers analyzed solutions implemented in four very different Brazilian cities. Based on the results, they propose the creation of a national carbon credit fund to support sustainable waste management initiatives. Some 20,000 metric tons of municipal solid waste (MSW) are produced every day in metropolitan São Paulo, with household trash accounting for 12,000 tons and street cleaning (mainly sweeping, open-air market refuse collection, pruning and grass cutting) for 8,000 tons. [...]

Global warming may be interacting with regional rainfall and deforestation to accelerate forest loss in the Amazon, pushing it towards partial or total collapse. Research published on 14 February 2024 in Nature, has identified the potential thresholds of these stressors, showing where their combined effects could produce a ‘tipping point’ – in which the forest is so fragile that just a small disturbance could cause an abrupt shift in the state of the [...]

An article published in the journal ACS Sustainable Chemistry & Engineering brings good news for coffee buffs: the plastic in used coffee pods can be recycled to make filament for 3D printers, minimizing its environmental impact. [...] "We produced new conductive and non-conductive filaments from waste polylactic acid [PLA] from used coffee machine pods. There are many applications for these filaments, including conductive parts for machinery and sensors," Bruno Campos [...]

The last decade has seen some progress with studying plastic pollution, but there are still significant challenges, such as a lack of comparability of reported results, especially when it comes to microplastic particles. An article by three Brazilian researchers published in Environmental Science and Pollution Research aims to contribute to progress in this field by proposing a novel perspective on particle morphology. One problem is that there is no standard sample collection and analysis [...]

A new type of biofilm reactor adapted to Brazilian conditions and using polyurethane foam to lower costs can reduce the amount of nitrogen compounds in wastewater by as much as 70%, according to a recent report in the journal Environmental Technology. The researchers who conducted the study developed a mathematical model to analyze and predict the nitrogen removal mechanism. The biofilm comprised bacteria that converted nitrogen compounds into nitrogen gas, which is environmentally [...]

The eDNA method consists of extracting molecules of DNA present in water samples and identifying the species to which they belong by means of genetic markers. A scientific expedition in the Javari River basin on the border between Brazil, Colombia and Peru has demonstrated the use of environmental DNA sequencing to be feasible to investigate fish diversity in the Amazon. An article on the research was published in the journal Scientific Reports. “We need to continue catching and [...]