Water for small-scale biogas digesters in sub-Saharan Africa

Acknowledgements This work was part-funded by the UK Natural Environment Research Council funded ESPA project, NE/K010441/1 ‘ALTER – Alternative Carbon Investments in Ecosystems for Poverty Alleviation’. We are also grateful to the AUC for funding part of this work under the Afri-Flame project on ‘Adapta- tion of small-scale biogas digesters for use in rural households in sub-Saharan AfricaPeer reviewedPublisher PD

Assessing the utility of geospatial technologies to investigate environmental change within lake systems

Over 50% of the world's population live within 3. km of rivers and lakes highlighting the on-going importance of freshwater resources to human health and societal well-being. Whilst covering c. 3.5% of the Earth's non-glaciated land mass, trends in the environmental quality of the world's standing waters (natural lakes and reservoirs) are poorly understood, at least in comparison with rivers, and so evaluation of their current condition and sensitivity to change are global priorities. Here it is argued that a geospatial approach harnessing existing global datasets, along with new generation remote sensing products, offers the basis to characterise trajectories of change in lake properties e.g., water quality, physical structure, hydrological regime and ecological behaviour. This approach furthermore provides the evidence base to understand the relative importance of climatic forcing and/or changing catchment processes, e.g. land cover and soil moisture data, which coupled with climate data provide the basis to model regional water balance and runoff estimates over time. Using examples derived primarily from the Danube Basin but also other parts of the World, we demonstrate the power of the approach and its utility to assess the sensitivity of lake systems to environmental change, and hence better manage these key resources in the future

Adaptation of global land use and management intensity to changes in climate and atmospheric carbon dioxide

Land use contributes to environmental change, but is also influenced by such changes. Climate and atmospheric carbon dioxide (CO2) levels\u27 changes alter agricultural crop productivity, plant water requirements and irrigation water availability. The global food system needs to respond and adapt to these changes, for example, by altering agricultural practices, including the crop types or intensity of management, or shifting cultivated areas within and between countries. As impacts and associated adaptation responses are spatially specific, understanding the land use adaptation to environmental changes requires crop productivity representations that capture spatial variations. The impact of variation in management practices, including fertiliser and irrigation rates, also needs to be considered. To date, models of global land use have selected agricultural expansion or intensification levels using relatively aggregate spatial representations, typically at a regional level, that are not able to characterise the details of these spatially differentiated responses. Here, we show results from a novel global modelling approach using more detailed biophysically derived yield responses to inputs with greater spatial specificity than previously possible. The approach couples a dynamic global vegetative model (LPJ-GUESS) with a new land use and food system model (PLUMv2), with results benchmarked against historical land use change from 1970. Land use outcomes to 2100 were explored, suggesting that increased intensity of climate forcing reduces the inputs required for food production, due to the fertilisation and enhanced water use efficiency effects of elevated atmospheric CO2 concentrations, but requiring substantial shifts in the global and local patterns of production. The results suggest that adaptation in the global agriculture and food system has substantial capacity to diminish the negative impacts and gain greater benefits from positive outcomes of climate change. Consequently, agricultural expansion and intensification may be lower than found in previous studies where spatial details and processes consideration were more constrained

How Market-Based Water Allocation Can Improve Water Use Efficiency in the Aral Sea Basin?

Increasing water demand due to population growth, irrigation expansion, industrial development, and the need for ecosystem improvements under mounting investment costs for developing new water sources calls for the efficient, equitable and sustainable management of water resources. This is particularly essential in the Aral Sea Basin (ASB) where ineffective institutions are the primary reason of intersectoral and inter-state water sharing conflicts and lack of sufficient investments for improving water use efficiency. This study examined market-based water allocation as an alternative option to the traditional administrative allocation to deal with water scarcity issues in the ASB. Potential economic gains of tradable water use rights were analyzed based on a newly constructed integrated hydro-economic river basin management model. The analysis differentiates between inter- catchment and intra-catchment water trading. The former does not consider any restrictions on water trading whereas the latter is based on the assumption that water trading is more likely to happen between neighboring water users located within the same catchment area. The analyses show that compared to fixed water allocation, inter-catchment water trading can improve basin-wide benefits by US$373 and US$ 476 million depending on water availability. Similarly, additional gains of US$259 to US$ 339 million are estimated under intra-catchment water trading depending on relative water availability. Trading gains are higher under drier conditions. However, water trading carries a series of transaction costs. We find that transaction costs exceeding US$0.05 per m3 of water traded wipe out the economic potential for water trading. Enforcement of the rule of law, infrastructural improvements, participation of representatives of all water stakeholders in decision making processes, and friendly relationships among the riparian countries are suggested as means for reducing transaction costs of water trading contracts

Lifestyle Choices and Societal Behavior Changes as Local Climate Strategy

The Asia-Pacific region is witnessing rapid economic growth. Along with rising incomes, the lifestyles of the large middle class are moving quickly towards a buy-and-discard consumer model that involves carbon-intensive products and services. These increase dependency on the Earth's finite natural resources and simultaneously produces waste, putting a significant strain on the environment. Such lifestyles, coupled with scarce resources and frequent natural hazards associated with climate change, pose serious threats to the future of the planet. Developed countries with high footprint per capita are under pressure to adjust their lifestyles that respect the Earths' carrying capacity. As far as countries in the Asia and Pacific region are concerned, mere technological solutions such as improving production efficiency will not be adequate to address climate change; a paradigm shift to more resource-efficient and low-carbon lifestyles, that promote inclusive and efficient consumption is the need of the hour. Several examples of good practices and community initiatives can be found around the world, but these have yet to be brought to the mainstream in order to achieve tangible results. Governments and policy makers in the Asia-Pacific can join hands with businesses and civil society to accelerate this transition - from a consumption-oriented economic paradigm, to a more sustainable way of production and consumption. This paper attempts to identify lifestyle changes at the individual level, and behavioral changes at the community level that could offer high carbon abatement potential. It also provides some good practices of public policies and policy recommendations that can be pivotal in making a business case of low-carbon and eco-efficient lifestyles, strengthening collective awareness, and influencing public decision-making in developing countries in Asia