The article talks about how the food we eat can produce greenhouse gases that harm the environment. It suggests that changing what schools serve for meals to be less harmful could make a big difference. The researchers developed a way to measure the carbon footprint of school meals. This tool allows decision-makers to compare schools, find those with low emissions to learn from, and identify schools that can improve. They looked at 10 schools in Stockholm and found differences in their carbon footprints. The study shows that changing school meals can be a powerful way to reduce greenhouse gas emissions.