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The contamination of karst aquifers by anthropogenic activities causes a major issue regarding environmental policies, since they present high sensitivity, influenced by unique features such as dolines, swallow holes, and conduits. This paper is focused on the Carste Lagoa Santa Protection Unit, MG, Brazil, and presents three main objectives: to determine the natural background levels of chloride, nitrate, sulfate, and phosphate; to indicate the locations where the concentrations of those parameters exceed the natural background levels in the existing vulnerability map and, finally, to determine the proportion of the areas (in percentage) where this surpassing occurs, according to the vulnerability classes (high, moderate and low). Results have shown values (90th percentile) of 2.4 mg/L, 1.0 mg/L, 5.3 mg/L, and 0.1 mg/L, for Cl−, NO3−, SO4−2, and PO4−3, respectively, indicating that for all four parameters, there were areas (mainly distributed within moderate vulnerability portions) where the values were surpassed, which suggests anthropogenic activity due to the presence of urban settlements and agricultural activities. Therefore, the proposal of natural background levels was essential to understand the hydrochemistry of the studied region. [ABSTRACT FROM AUTHOR]

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Copyright of Ambiente & Sociedade is the property of Nepam Unicamp and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study deals with the environmental regularization of mining activities in the State of Minas Gerais, Brazil, where such activities exhibit prominent economic, social and environmental importance. The main environmental rules and data from the licensing system are analyzed, focusing on the post-licensing stage, when the system is partially hampered due to insufficient technical assessment and nonsystematic inspection of the impacting activities by the environmental authorities. A preliminary assessment of the changes introduced in the environmental system in the last five years is also made, and comprise: the regional decentralization of the licensing system - and of the environmental management as a whole -, with eight regional offices, and the institution of the declaratory authorization for environmental operation of minor enterprises with potentially less degrading activities, in substitution of the traditional licensing system. [ABSTRACT FROM AUTHOR]

Purpose - The purpose of this research was to identify the major environmental impacts occurring in Melo Creek, Minas Gerais, Brazil, especially as regards to its water quality. Design/methodology/approach - Initial evaluation was based on aerial photograph interpretation. All the small creek catchments were delimited and 12 stream segments were chosen for sampling and analyses. The segments had their water discharge calculated and channel pattern described. Also determined for these segments were the physical and chemical parameters of the water, as well as the microbiological content. Both water and sediment samples were analyzed for metals and trace element quantification. Meanwhile, an environmental inquiry was conducted in all the small villages along the creek. Findings - Data show a decrease in water discharge during the last decades, related to the increased destruction of the Atlantic Forest, especially at the riverheads and in permanent preservation areas (PPA). Most of the native vegetation was cut down to create farmlands and pasture. The water quality is also diminishing because for most of the properties, the main activities are pig raising and sugarcane liqueur production, which discharge their untreated effluents, along with domestic wastewater and sewage, directly into the creek. The results indicated that during its passage through the catchment, stream water became significantly contaminated with fecal coliform bacteria. As a consequence, the area possesses a high endemic disease index for water transmitted parasitism, especially for Schistosomiasis mansoni. Originality/value - This was the first study done in the Melo catchment, a small rural basin without basic sanitation and with a highly prevalent schistosomiasis rate. [ABSTRACT FROM AUTHOR]

Brazil has created a market mechanism for compensating past deforestation based on the acquisition of forest surplus from different properties. This mechanism, known in Brazil as the 'CRA market', could become the world's largest forest compensation program. The success of this market depends on the specifics of regulations that are yet to come. The objective of this article was to explore three relevant issues to the regulation of a future CRA market within the Atlantic Forest of Minas Gerais state: the balance between supply and demand; incentives for trade in priority areas; and potential policy overlaps between different compensation programs. Based on geospatial evaluations and content analysis of government documents, the study revealed a potential oversupply of CRAs in the Minas Gerais Atlantic Forest, as surplus areas were found to be 2.76 greater than deficit areas. Eventual incentives for trade in priority areas could lessen oversupply, but unfold into sensitive territorial trade-offs. The potential overlap between the CRA market and the existing compensation program of the Atlantic Forest Act, while still unclear, is unlikely to be a very relevant one. Future avenues of research are suggested. • The CRA market could become the world's largest forest compensation program. • Relevant issues for an eventual Atlantic Forest market are evaluated. • CRA oversupply is likely to occur. • Incentive for trade in priority areas could unfold into controversial trade-offs. • Interactions between compensation programs need further investigation. [ABSTRACT FROM AUTHOR]