School clubs could look to start a Meatless Mondays program at their school or students could advocate for more plants in their diets at home.
To extend the lesson for more advanced students, the global impacts of food production and agriculture can be explored in this interactive data resource and in this StC lesson plan about the impacts of food on the climate.
This resource is a simple (< 5 minute) survey that calculates your carbon, nitrogen, and water footprint based on the foods you eat in a given week. Your results are compared to the U.S. average and to an estimate of a sustainable diet. Although simple, this resource is a great introduction to one's personal dietary footprint, and thus this resource is recommended for teaching.
Next Generation Science Standards (NGSS)
ESS3: Earth and Human Activity
MS-ESS3-4 Construct an argument supported by evidence for how increases in human population and per-capita consumption of natural resources impact Earth's systems.
College, Career, and Civic Life (C3) Standards
Dimension 4: Taking Informed Action
D4.7.6-8 Assess their individual and collective capacities to take action to address local, regional, and global problems, taking into account a range of possible levers of power, strategies, and potential outcomes.
D4.7.3-5 Explain different strategies and approaches students and others could take in working alone and together to address local, regional, and global problems, and predict possible results of their actions.
D4.8.3-5 Use a range of deliberative and democratic procedures to make decisions about and act on civic problems in their classrooms and schools.