Arsenic poisoning constitutes a major threat to humans, causing various health problems. Almost everywhere across the world certain “hotspots” have been detected, putting in danger the local populations, due to the potential consumption of water or food contaminated with elevated concentrations of arsenic. According to the relevant studies, Asia shows the highest percentage of significantly contaminated sites, followed by North America, Europe, Africa, South America and Oceania. The presence of arsenic in ecosystems can originate from several natural or anthropogenic activities. Arsenic can be then gradually accumulated in different food sources, such as vegetables, rice and other crops, but also in seafood, etc., and in water sources (mainly in groundwater, but also to a lesser extent in surface water), potentially used as drinking-water supplies, provoking their contamination and therefore potential health problems to the consumers. This review reports the major areas worldwide that present elevated arsenic concentrations in food and water sources. Furthermore, it also discusses the sources of arsenic contamination at these sites, as well as selected treatment technologies, aiming to remove this pollutant mainly from the contaminated waters and thus the reduction and prevention of population towards arsenic exposure.

This article summarizes the results of water productivity assessment in 10 river basins across Asia, Africa and South America, representing a range of agro-climatic and socio-economic conditions. Intensive farming in the Asian basins gives much greater agricultural outputs and higher water productivity. Largely subsistence agriculture in Africa has significantly lower water productivity. There is very high intra-basin variability, which is attributed mainly to lack of inputs, and poor water and crop management. Closing gaps between “bright spots” and the poorly performing areas are the major tasks for better food security and improved livelihoods, which have to be balanced with environmental sustainability.

Asia, Europe, Oceania, North America, South America, Middle East and Africa.The purpose of this paper is to review and analyze the water, energy, and food nexus and regions of study, nexus keywords and stakeholders in order to understand the current state of nexus research.Through selected 37 projects, four types of nexus research were identified including water–food, water–energy–food, water–energy, and climate related. Among them, six projects (16%) had a close linkage with water–food, 11 (30%) with water–energy–food, 12 (32%) with water–energy, and eight (22%) with climate. The regions were divided into Asia, Europe, Oceania, North America, South America, Middle East and Africa. North America and Oceania had a tendency to focus on a specific nexus type, water–energy (46%) and climate (43%), while Africa had less focus on water–energy (7%). Regarding keywords, out of 37 nexus projects, 16 projects listed keywords in their articles. There were 84 keywords in total, which were categorized by the author team depending on its relevance to water, food, energy, climate, and combination of water–food–energy–climate, and 40 out of 84 keywords were linked with water and only 4 were linked with climate. As for stakeholders, 77 out of 137 organizations were related to research and only two organizations had a role in media.

World hunger, according to the 2012 Global Hunger Index (GHI), has declined somewhat since 1990 but remains “serious.” The global average masks dramatic differences among regions and countries. Regionally, the highest GHI scores are in South Asia and Sub-Saharan Africa. South Asia reduced its GHI score significantly between 1990 and 1996—mainly by reducing the share of underweight children— but could not maintain this rapid progress. Though Sub-Saharan Africa made less progress than South Asia in the 1990s, it has caught up since the turn of the millennium, with its 2012 GHI score falling below that of South Asia. From the 1990 GHI to the 2012 GHI, 15 countries reduced their scores by 50 percent or more. In terms of absolute progress, between the 1990 GHI and the 2012 GHI, Angola, Bangladesh, Ethiopia, Malawi, Nicaragua, Niger, and Vietnam saw the largest improvements in their scores. Twenty countries still have levels of hunger that are “extremely alarming” or “alarming.” Most of the countries with alarming GHI scores are in Sub-Saharan Africa and South Asia (the 2012 GHI does not, however, reflect the recent crisis in the Horn of Africa, which intensified in 2011, or the uncertain food situation in the Sahel). Two of the three countries with extremely alarming 2012 GHI scores—Burundi and Eritrea—are in Sub-Saharan Africa; the third country with an extremely alarming score is Haiti. Its GHI score fell by about one quarter from 1990 to 2001, but most of this improvement was reversed in subsequent years. The devastating January 2010 earthquake, although not yet fully captured by the 2012 GHI because of insufficient availability of recent data, pushed Haiti back into the category of “extremely alarming.” In contrast to recent years, the Democratic Republic of Congo is not listed as “extremely alarming,” because insufficient data are available to calculate the country’s GHI score. Current and reliable data are urgently needed to appraise the situation in the country. | Non-PR | IFPRI2; GRP24 | COM; MTID; DGO; EPTD; PHND; WCAO

Access to reliable and affordable energy is vital for sustainable development. In the off-grid areas of developing countries, decentralized energy solutions have received increasing attention due to their contributions to reducing poverty. However, most of the rural population in many developing countries still has little or no access to modern energy technologies. This paper assesses the factors that determine the successes and failures of decentralized energy solutions based on local harmonized case studies from heterogeneous contexts from Asia, sub-Saharan Africa, and South America. The case studies were analyzed through the coupled lenses of energy transition and the Water–Energy–Food Security (WEF) Nexus. The findings indicate that access to modern decentralized energy solutions has not resulted in complete energy transitions due to various tradeoffs with the other domains of the WEF Nexus. On the other hand, the case studies point at the potential for improvements in food security, incomes, health, the empowerment of women, and resource conservation when synergies between decentralized energy solutions and other components of the WEF Nexus are present.

De acuerdo con el Índice Global del Hambre (GHI, por sus siglas en inglés) de 2012, el hambre a nivel mundial ha disminuido algo desde 1990 pero continúa siendo “serio”. El promedio global enmascara diferencias dramáticas entre regiones y países. A nivel regional, los mayores puntajes del GHI se encuentran en Asia meridional y en el África Subsahariana. Asia meridional redujo sus puntajes de GHI de forma significativa entre 1990 y 1996 —principalmente a través de una reducción en la proporción de niños con bajo peso— pero no pudo mantener este rápido progreso. Y aunque el África Subsahariana progresó menos que Asia meridional en la década de 1990, ha logrado reducir la brecha a partir del nuevo milenio, con un puntaje del GHI en 2012 apenas por debajo del obtenido por Asia meridional. | Non-PR | IFPRI2; GRP24 | COM; MTID; DGO; EPTD; PHND; WCAO

Book | COM; MTID; DGO; EPTD; PHND; WCAO | De acuerdo con el Índice Global del Hambre (GHI, por sus siglas en inglés) de 2012, el hambre a nivel mundial ha disminuido algo desde 1990 pero continúa siendo “serio”. El promedio global enmascara diferencias dramáticas entre regiones y países. A nivel regional, los mayores puntajes del GHI se encuentran en Asia meridional y en el África Subsahariana. Asia meridional redujo sus puntajes de GHI de forma significativa entre 1990 y 1996 —principalmente a través de una reducción en la proporción de niños con bajo peso— pero no pudo mantener este rápido progreso. Y aunque el África Subsahariana progresó menos que Asia meridional en la década de 1990, ha logrado reducir la brecha a partir del nuevo milenio, con un puntaje del GHI en 2012 apenas por debajo del obtenido por Asia meridional. | IFPRI2; GRP24 | Non-PR