  Given the increasing pressures exerted by climate change on small-scale
agriculture, the importance of participatory modelling methodologies that can
consider both the human and environmental components of these systems has
become more and more evident. The current study presents a socioeconomic system
dynamics model of the food and environmental systems of the predominantly
Indigenous region of Tz'ol{\"o}j Ya', Guatemala. The model was built in a
participatory manner with stakeholders from the region and was then coupled to
an external crop growth model before being applied to the analysis of the
impact of future climate change and its potential interactions with various
stakeholder-proposed policies. The analysis identified several feedback loops
between environmental and human components of the system that can lead to
counterintuitive responses to the proposed policies. At the same time, the use
of an external crop growth model allowed for a more realistic, yet still easily
implementable, representation of the impacts of climate change on crop
production. This analysis is the first to use a socioeconomic system dynamics
model coupled with an external crop growth model to analyse food security in
the context of a local socio-environmental food system.
