This review covers two major causes of change in pastoral systems. First is fragmentation, the dissection of a natural system into spatially isolated parts, which is caused by a number of socioeconomic factors such as changes in land tenure, agriculture, sedentarization, and institutions. Second is climate change and climate variability, which are expected to alter dry and semiarid grasslands now and into the future. Details of these changes are described using examples from Africa and Mongolia. An adaptation framework is used to place global change in context. Although pastoral systems are clearly under numerous constraints and risks have intensified, pastoralists are adapting and trying to remain flexible. It is too early to ask if the responses are enough, given the magnitude and number of changes faced by pastoralists today.

Rangelands cover more of Earth's land surface than any other type of land. They have variable and harsh climates, are sparsely populated and remote from markets, produce significant quantities of livestock, and are mostly used and managed in common. Under this already unpredictable and harsh climate, pastoral peoples and rangelands face new and accelerating political, economic, and climatic stresses that challenge their coupled resilience and ability to adapt. In response, pastoralists are creating new ways to manage rangelands through conservancies and community-based institutions on state, common, and private land. In this review, we focus on recent advances in our understanding of rangeland social-ecological systems, as well as on the causes and consequences of change in these systems. We then explore how pastoral peoples, governments, and businesses are responding to these changes to build resilience to sustain both pastoralism and rangelands. We close with a description of unresolved issues, challenges, and questions for the future. 217 Annu. Rev. Environ. Resourc. 2014.39:217-242. Downloaded from www.annualreviews.org Access provided by Monash University on 12/15/14. For personal use only.

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o-production is a rapidly growing endeavour now widely applied in the fields of health, development, education, climate change, industrial production and sustainability [1][2][3][4][5][6] . It broadly seeks to connect researchers with diverse societal actors to collaboratively and iteratively produce knowledge, action and societal change 1 . The promise is compelling: developing solutions through legitimate processes that draw on diverse and credible expertise with, by and for those best placed to use them 5,7,8 . Sustainability