Wastewater irrigation: the state of play

As demand for fresh water intensifies, wastewater is frequently being seen as a valuable resource. Furthermore, wise reuse of wastewater alleviates concerns attendant with its discharge to the environment. Globally, around 20 million ha of land are irrigated with wastewater, and this is likely to increase markedly during the next few decades as water stress intensifies. In 1995, around 2.3 billion people lived in water-stressed river basins and this could increase to 3.5 billion by 2025. We review the current status of wastewater irrigation by providing an overview of the extent of the practice throughout the world and through synthesizing the current understanding of factors influencing sustainable wastewater irrigation. A theme that emerges is that wastewater irrigation is not only more common in water-stressed regions such as the Near East, but the rationale for the practice also tends to differ between the developing and developed worlds. In developing nations, the prime drivers are livelihood dependence and food security, whereas environmental agendas appear to hold greater sway in the developed world. The following were identified as areas requiring greater understanding for the long-term sustainability of wastewater irrigation: (i) accumulation of bioavailable forms of heavy metals in soils, (ii) environmental fate of organics in wastewater-irrigated soils, (iii) influence of reuse schemes on catchment hydrology, including transport of salt loads, (iv) risk models for helminth infections (pertinent to developing nations), (v) microbiological contamination risks for aquifers and surface waters, (vi) transfer efficiencies of chemical contaminants from soil to plants, (vii) health effects of chronic exposure to chemical contaminants, and (viii) strategies for engaging the public.<br /

Building capacity for climate adaptation planning in protected area management: Options and challenges for World Heritage

"Response and adaptation to the impacts of climate change is a vital and increasing requirement for protected area management. On the ground managers of cultural and natural values in protected places have requested practical guidance on how to undertake climate change impact analysis, vulnerability assessment, and adaptation plan- ning together with enhanced capacity for planning with partners, rightsholders and stakeholders. In this paper we explore how co-development and subsequent testing among World Heritage site managers, Indigenous ex- perts and researchers, produced guidance for assessing, responding to and planning for the impacts of climate change on the diverse values of World Heritage sites in Australia. We draw on the diversity of cultural and natural heritage values associated with the terrestrial, coastal and marine environments in Australian World Heritage sites, and the broad range of institutional contexts in these sites, to highlight considerations of relevance to other protected areas (including other World Heritage sites around the world, Ramsar wetlands and marine protected areas). Our paper highlights that, for climate adaptation planning to become a normal part of man- agement, there is a need for ongoing capacity building, including around the use of climate information to inform adaptation planning and implementation, as well as integrating Indigenous perspectives. Building capacity mayinvolve trial and error, negotiation, sharing, sourcing and interpreting new information, and changes in""expectations. It will require novel and more dynamic relationships between partners and stakeholders. Managers should include capacity building for climate adaptation planning and implementation as a specific climate"adaptation task in their planning.