The earth’s climate is changing at a rate unprecedented in recent human history and will continue to do so for the foreseeable future. The impacts and risks associated with this are global, geographically diverse and increasingly being felt across a range of systems and sectors essential for human livelihoods and well-being. The more severe and far-reaching the impacts of climate change are, the greater the loss of species will be, and the greater the deterioration of drylands and the risk of desertification and land degradation around the world will be.

The year 2012 marks the twentieth anniversary of the Rio Earth Summit, which resulted in the establishment of the three Rio Conventions: the Convention on Biological Diversity (CBD), the United Nations Convention to Combat Desertification (UNCCD ) and the United Nations Framework Convention on Climate Change (UNFCCC ).

International policy and decision makers now recognize that the link between environmental change and migration has grave consequences for human security. The paradigm of security has shifted away from purely state-centered models to a model that encompasses the greater idea of human development as freedom. The new model implies greater international awareness of the importance of sustainable development for all people – including an intact environment and the ability of all people to enjoy good health and respectable work.

Aquellos que formulan políticas y decisiones internacionales reconocen que la relación entre el cambio medioambiental y la migración tiene graves consecuencias para la seguridad humana. El paradigma de la seguridad se ha alejado de los modelos centrados exclusivamente en el Estado para acercase a un patrón que contempla una idea más amplia: la del desarrollo humano como modelo de libertad.

As the world reviews its progress in tackling global poverty and achieving the Millennium Development Goals (MDGs), drylands can no longer be ignored. Drylands account for more than a third of the world’s land surface and more than 2 billion of its people. Yet for too long, drylands and their inhabitants have been neglected in development processes.

We analyse the threats of global environmental change, as they relate to food security. First, we review three discourses: (i) ‘sustainable intensification’, or the increase of food supplies without compromising food producing inputs, such as soils and water; (ii) the ‘nexus’ that seeks to understand links across food, energy, environment and water systems; and (iii) ‘resilience thinking’ that focuses on how to ensure the critical capacities of food, energy and water systems are maintained in the presence of uncertainties and threats.

The Southern African Development Community’s (SADC) water and energy sectors are under increasing pressure due to population growth and agricultural and industrial development. Climate change is also negatively impacting on the region’s water and energy resources. As the majority of SADC’s population lives in poverty, regional development and integration are underpinned by water and energy security as the watercourses in the region are transboundary in nature. This paper reviews the region’s water and energy resources and recommends policies based on the water–energy nexus approach.

Often, when people think of drylands, they think of deserts and hostile living conditions, economic hardship and water scarcity. But that is not what drylands are all about. If managed well, drylands are often fertile and capable of supporting the habitats, crops and livestock that sustain the entire global population.