K-12 schools in the United States significantly contribute to greenhouse gas emissions due to aging infrastructure, inefficient energy practices, and a heavy reliance on fossil fuels. Addressing these issues through decarbonization is not just important--it is becoming a critical initiative aimed at reducing environmental impact while simultaneously improving the educational environments we offer our students. This paper examines the current landscape of decarbonization efforts in K-12 schools, focusing on our challenges, opportunities, and emerging best practices. By analyzing existing strategies and policies at the federal, state, and local levels, this paper highlights how these efforts are supported--or, in some cases, hindered--by the frameworks in place. The benefits of decarbonization are clear: improved indoor air quality, enhanced learning conditions, and reduced operational costs, all of which contribute to a healthier and more effective educational environment. This research also delves into successful case studies, showcasing innovative approaches and replicable models in other schools nationwide.