Armed with an overview of the complexity of issues associated with global food security, this unit begins by contextualizing food security as an example of a wicked problem. Wicked problems are problems that are unsolvable in the traditional sense, and have complex multiscalar causal factors that contribute to the creation of new issues as old ones are addressed. Both global food security and climate change are examples of wicked problems. This unit presents systems thinking as a way to identify complex problems and explore solutions. Using a flipped classroom model, students complete a self study tutorial that presents system concepts in the context of Earth system science. The slide stack includes two guided activities related to the carbon cycle and soils. A short reading, "Why Systems Thinking?" and a video clip is included in the tutorial. Authentic assessment of the homework activity is an Earth system diagram connected to one of the issues of global food security from Unit 1 that they will bring to class. After a short class discussion that introduces concepts of sustainability and ecosystem services as related to food production, students are broken into groups and are asked to create their own systems diagram of the global food system, using the organizational systems concepts they examined as homework and the introduction activities of Unit 1. After completing the diagrams, students examine a food system diagram example, and identify the components of the system using standardized systems language. Students can photograph their diagrams or make quick sketches so they have a working copy to include with their notes.

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This unit applies a flipped classroom model. Students complete a self-study tutorial prior to attending class. Students are then asked work independently or in pairs to generate a time-aware climate change Web map application using ArcGIS Online. Returning to the theme of cocoa production introduced in Unit 1, students identify climatic conditions conducive for cacao production around the world, especially West Africa where the majority of cacao is grown. Students then use a web application in ArcGIS Online to create a time aware map showing biomes in the KÃppen Climate Classification System and determine how projected climate changes will impact the suitable production regions for cacao in West Africa. Using a jigsaw model, students collect into groups of 4, with a representative from each of the IPCC scenarios, and they compare the the impact of the 4 scenarios in specified cocoa production regions. At the end of the class they will be assigned to one of three regional areas for group work in Units 4-6.

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In the capstone, Unit 3, students are provided a real-world example of local community action to address the challenge of "healthy food access." The 2015 Leon County (Florida) Sustainable Communities Summit highlights the results of communities working together to promote environmental and food justice. By the end of Unit 3, instructors can deliver a call to action to empower students to be participatory citizens in their communities. The summative assessment will evaluate the students' ability to synthesize the module learning objectives and demonstrate the use of science practices.

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Units 4, 5, and 6 provide the opportunity for students to delve into a greater examination of food security at a regional level in small teams selecting one of the following locations (Caribbean, New York City, or Nebraska) OR a new location of their choice (provided that information and datasets are easily available and students will work with the instructor prior to the start of the unit) to apply skills and concepts taught in Units 1-3. Unit 4 materials are designed to provide a place-based overview for students to prepare them for the summative assessment, to be submitted in Unit 6, a community-based action plan of how the selected community can increase food security and lessen vulnerability.

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Unit 5 will delve more into an examination of food security using online ArcGIS. The class begins with a GIS-based exploration of data available for the three regions. The rest of the class period is provided for group work creating an action plan for a food insecurity issue teams have identified for their region. Students will utilize their maps from ArcGIS Online within their action plan. One component of the summative assessment, to be submitted in Unit 6, is a community-based action plan of how the selected community can increase food security and lessen vulnerability.

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In this week-long unit students will explore Critical Zone function and dynamics as they relate to nutrient cycling in agricultural systems and nutrient pollution into aquatic systems. This unit is generally subdivided into three sections: (1) nutrient pollution (2) agricultural importance and (3) Critical Zone function and dynamics in relation to nutrient cycling. The students will use data sets, interactive activities, primary literature, and videos to allow them to examine the role that the CZ plays and how that role changes with differing land uses. Important present-day topics of food production, clean water, nutrient pollution, and sustainable agriculture are examined using a CZ lens. Students will interact with each other on a variety of scales (individual, small groups, entire class) and using a variety of modes (presentations, written reports, question and answers, and class discussion) in this unit. Additionally, optional activities are provided if lab activities are able to be accommodated. The unit ends with a summative assessment assignment that is based on an innovative call for proposals to combat one of America's most widespread, costly, and challenging environmental problems: nutrient pollution.

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Unit 6 provides an opportunity for students to present their action plans and exchange knowledge about what they have learned in their team case study work. This unit builds on food security and Earth system science covered in the first three units. It can be taught in any course discussing food security or it can be modified to fit a variety of courses of in the sciences and social sciences. The activities included in this unit are appropriate for introductory-level college students or as a basis for more in-depth class discussions on food security for upper-level students.

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Humans not only reside in the Critical Zone, they depend upon the land and water to provide sustenance. This unit will examine how humans affect soil resources and ecosystem services in the Critical Zone through food production. In addition, it will discuss farming practices that led to the Dust Bowl in the 1930s. Finally, it will examine emerging efforts to grow food locally such as Community Supported Agriculture (CSAs) and urban gardening programs.

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The concept of water activity is important to food preservation. When water activity is less than 0.6, almost all microbes, including bacteria, molds, and yeasts, stop growing. Vegetables are usually dried even further, to water activity of 0.3 or 0.2, for quality and storage. Virtual Labs – Controlling Water Activity in Food explores a traditional method of preserving corn by drying. In this virtual laboratory, learners test water activity levels of dried corn and explore how they change under three different storage environments. The interactive animation guides users through the theory and practice of sampling a food product, using a water activity meter, and setting up replicates, to build familiarity with concepts and procedures used in real food science labs. Before beginning this lab, it may be useful to complete Virtual Labs – Understanding Water Activity.