| Sumario: | Food security research programmes, such as Global Environmental Change and Food Systems (GECAFS) and the
CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), need to consider
extremely complex systems, with many agricultural, environmental, social and economic subsystems interacting
with each other on a variety of scales and at a variety of levels on each. This poses considerable challenges in
terms of representing the current state of knowledge, exploring how these systems might evolve in the future in
response to external drivers and human input, and displaying the behaviour of the many variables involved in a
way which is meaningful for stakeholders and policy advisers.
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