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We have learned in our Environmental Science class that an effective way to decrease greenhouse gas emissions (i.e., carbon dioxide) is for individuals and small groups of people to grow their own food in community gardens and small-scale farms. In order to do that, we need nutrient-rich soil, which is not always easy to locate in an urban environment so impacted by construction and the pollution that results from infrastructural maintenance. At PCA (as in most U.S. schools), we generate many pounds of solid waste a year. But we can at least compost food / organic matter and sell the compost to local gardeners to help our communities and fund educational materials and excursions.