M. Huijbregts, Zoran J. N. Steinmann, Pieter M F Elshout
et al.
PurposeLife cycle impact assessment (LCIA) translates emissions and resource extractions into a limited number of environmental impact scores by means of so-called characterisation factors. There are two mainstream ways to derive characterisation factors, i.e. at midpoint level and at endpoint level. To further progress LCIA method development, we updated the ReCiPe2008 method to its version of 2016. This paper provides an overview of the key elements of the ReCiPe2016 method.MethodsWe implemented human health, ecosystem quality and resource scarcity as three areas of protection. Endpoint characterisation factors, directly related to the areas of protection, were derived from midpoint characterisation factors with a constant mid-to-endpoint factor per impact category. We included 17 midpoint impact categories.Results and discussionThe update of ReCiPe provides characterisation factors that are representative for the global scale instead of the European scale, while maintaining the possibility for a number of impact categories to implement characterisation factors at a country and continental scale. We also expanded the number of environmental interventions and added impacts of water use on human health, impacts of water use and climate change on freshwater ecosystems and impacts of water use and tropospheric ozone formation on terrestrial ecosystems as novel damage pathways. Although significant effort has been put into the update of ReCiPe, there is still major improvement potential in the way impact pathways are modelled. Further improvements relate to a regionalisation of more impact categories, moving from local to global species extinction and adding more impact pathways.ConclusionsLife cycle impact assessment is a fast evolving field of research. ReCiPe2016 provides a state-of-the-art method to convert life cycle inventories to a limited number of life cycle impact scores on midpoint and endpoint level.
A leaky endeavor Considerable amounts of the greenhouse gas methane leak from the U.S. oil and natural gas supply chain. Alvarez et al. reassessed the magnitude of this leakage and found that in 2015, supply chain emissions were ∼60% higher than the U.S. Environmental Protection Agency inventory estimate. They suggest that this discrepancy exists because current inventory methods miss emissions that occur during abnormal operating conditions. These data, and the methodology used to obtain them, could improve and verify international inventories of greenhouse gases and provide a better understanding of mitigation efforts outlined by the Paris Agreement. Science, this issue p. 186 Methane leakage from the U.S. oil and natural gas supply chain is much greater than previously estimated. Methane emissions from the U.S. oil and natural gas supply chain were estimated by using ground-based, facility-scale measurements and validated with aircraft observations in areas accounting for ~30% of U.S. gas production. When scaled up nationally, our facility-based estimate of 2015 supply chain emissions is 13 ± 2 teragrams per year, equivalent to 2.3% of gross U.S. gas production. This value is ~60% higher than the U.S. Environmental Protection Agency inventory estimate, likely because existing inventory methods miss emissions released during abnormal operating conditions. Methane emissions of this magnitude, per unit of natural gas consumed, produce radiative forcing over a 20-year time horizon comparable to the CO2 from natural gas combustion. Substantial emission reductions are feasible through rapid detection of the root causes of high emissions and deployment of less failure-prone systems.
Consumption of food crops contaminated with heavy metals is a major food chain route for human exposure. We studied the health risks of heavy metals in contaminated food crops irrigated with wastewater. Results indicate that there is a substantial buildup of heavy metals in wastewater-irrigated soils, collected from Beijing, China. Heavy metal concentrations in plants grown in wastewater-irrigated soils were significantly higher (P<or=0.001) than in plants grown in the reference soil, and exceeded the permissible limits set by the State Environmental Protection Administration (SEPA) in China and the World Health Organization (WHO). Furthermore, this study highlights that both adults and children consuming food crops grown in wastewater-irrigated soils ingest significant amount of the metals studied. However, health risk index values of less than 1 indicate a relative absence of health risks associated with the ingestion of contaminated vegetables.
This paper seeks to develop an alternative account of the geographies of environmental governance to those current conceptions which tend to take space and scale for granted as pre-given, contained, natural entities. Through an engagement with the debates on the politics of scale, the argument is made that a new spatial grammar of environmental governance must be sensitive to both the politics of scale and the politics of networks. Rather than considering scalar and non-scalar interpretations of spatiality as necessarily opposite, the paper argues that through a more careful deployment of concepts of hierarchy and territory common ground between scalar and network geographies can be forged, and can inform our understanding of environmental governance. In making this argument, the paper provides an overview of contemporary configurations of global environmental governance, and seeks to illustrate by reference to one transnational municipal network, the Cities for Climate Protection programme, how governing the environment involves both political processes of scaling and rescaling the objects and agents of governance, as well as attempts to create new, networked, arenas of governance. The paper concludes that recognition of new spatial grammars is necessary for understanding emerging hybrid forms of environmental governance and their political and ecological implications.
Hasan Pasalari, Angila Ataei-Pirkooh, Mohammad Khanizadeh
et al.
Abstract A comprehensive study was developed to estimate the disease burden (DB) caused by NoV and RoV in the effluents of different stages of wastewater treatment process used for irrigation high-consumption vegetable. The sewage samples were withdrawn from raw wastewater, primary sedimentation tank outlet, secondary clarifier outlet and effluent of largest WWTP in middle east and analyzed in terms of RoV and NoV using RT-PCR. QMRA tools and DALY index were utilized to estimate the Probability of infection (Pinf), probability of illness (Pill) and disease burden (DB) via Monte-Carlo simulation technique and R software. The mean concentration of RoV in raw wastewater (234 Virus.mL−1) experienced a decreasing trend after primary purification (136 Virus.mL−1) and secondary sedimentation (53 Virus.mL−1); the minimum concentration of RoV was found in the effluent (12 Virus.mL−1). No species of NoV were detected in raw wastewater, primary sedimentation tank, secondary sedimentation tank, and effluent. The DALY index, obtained based on the concentration of RoV in all samples of sewage exceeded the values recommended by World Health Organization (WHO) (10−6 (per person per year) (pppy)) and the United States Environmental Protection Agency (10−4 pppy). The sensitivity analysis indicated that the variation in RoV concentration and the time between the last irrigation and consumption have highest contribution on DB. Generally, this first study in the field of QMRA in wastewater treatment train can help decision makers and governing bodies to justify the health attributed to infected sewage-irrigated vegetables and find promising approach to reduce the corresponding health risk.
Snežana Škaljac, Marija Jokanović, Tatjana Peulić
et al.
This study examined the safety of meat products from north Serbia (Vojvodina), smoked in traditional conditions, from a PAH point of view, and assessed the possibility of their reduction in these types of products. Samples of dry cured meat products, bacons and dry fermented sausages smoked in six different chambers on the territory of Vojvodina were examined. The contents of 16 polycyclic aromatic hydrocarbons, from the United States Environmental Protection Agency list (16 US-EPA PAHs), and sensory quality of meat products were determined. The total content of 16 US-EPA PAHs in dry cured meat products was in the range from 99.73 μg/kg to 412.76 μg/kg; in bacons it was in the range from 36.43 μg/kg to 188.86 μg/kg; and in dry fermented sausages in the range from 47.23 μg/kg to 270.60 μg/kg. The lowest contents of 16 US-EPA PAHs compounds were determined in meat products smoked in traditional conditions during 3–5 days (3–4 h per day) at a distance of 2.5 m between the fire and products. Generally, it can be concluded that shortening of smoking process is justified, because products of good sensory quality and with decreased content of PAHs compounds were obtained. Benzo[a]pyrene, whose maximum allowed content in smoked meat products is 2 μg/kg, was below the limit of detection in all examined traditional meat products from Vojvodina. Also, contents of PAH4, sum of benz[a]anthracene, chrysene, benzo[a]pyrene and benzo[b]fluoranthene, were in the range from ND to 2.22 μg/kg, still greatly lower than the set maximum value. These results indicated the safety of dry cured meat products, bacons and dry fermented sausages from the territory of north Serbia (Vojvodina), as defined by EU Regulation 2023/915 criteria for PAHs contents.