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Human-induced salinization caused by the use of road deicing salts, agricultural practices, mining operations, and climate change is a major threat to the biodiversity and functioning of freshwater ecosystems. Yet, it is unclear if freshwater ecosystems are protected from salinization by current water quality guidelines. Leveraging an experimental network of land-based and in-lake mesocosms across North America and Europe, we tested how salinization-indicated as elevated chloride (Cl - ) concentration-will affect lake food webs and if two of the lowest Cl - thresholds found globally are sufficient to protect these food webs. Our results indicated that salinization will cause substantial zooplankton mortality at the lowest Cl - thresholds established in Canada (120 mg Cl - /L) and the United States (230 mg Cl - /L) and throughout Europe where Cl - thresholds are generally higher. For instance, at 73% of our study sites, Cl - concentrations that caused a ≥50% reduction in cladoceran abundance were at or below Cl - thresholds in Canada, in the United States, and throughout Europe. Similar trends occurred for copepod and rotifer zooplankton. The loss of zooplankton triggered a cascading effect causing an increase in phytoplankton biomass at 47% of study sites. Such changes in lake food webs could alter nutrient cycling and water clarity and trigger declines in fish production. Current Cl - thresholds across North America and Europe clearly do not adequately protect lake food webs. Water quality guidelines should be developed where they do not exist, and there is an urgent need to reassess existing guidelines to protect lake ecosystems from human-induced salinization., Competing Interests: The authors declare no competing interest.

The article discusses climate change litigation in North America and Europe as of 2011. The article discusses human rights, environmental policy pertaining to topics such as carbon dioxide emissions, potential obstacles in proving the responsibility of emitters in U.S. courts, emissions trading in Europe, and civil liability.

Most automobiles carry one person and are used for less than one hour per day. A more economically rational approach would be to use vehicles more intensively. Carsharing, in which people pay a subscription plus a per-use fee, is one means of doing so. Carsharing may be organized through affinity groups, large employers, transit operators, neighborhood groups, or large carsharing businesses. While carsharing does not offer convenient access to vehicles, it does provide users with a large range of vehicles, fewer ownership responsibilities, and less cost (if vehicles are not used intensively). Societal benefits include less demand for parking space and the indirect benefits resulting from costs being more directly tied to actual usage and vehicles being matched to trip purpose. This article reviews the experience with shared-use vehicle services and explores their prospects for the future, focusing on the trend toward expanded services and use of advanced communication and reservation technologies. [ABSTRACT FROM AUTHOR]

The article focuses on the book "Global Environment Outlook," by United Nations Environment Programme. The book presents information on the state of the global environment and also reviews major environmental issues from the regional perspectives of Africa, Asia and the Pacific, Europe and the Commonwealth of Independent States, Latin America and the Caribbean, North America, West Asia and the Arctic and Antarctic. It also highlights the possible future impacts on the environment of current development process.