UNESCO has indicated the need for more research to test the effectiveness of education for sustainable development (ESD). This study analyzes how ESD is included in the Finnish national core curriculum and examines four environmental indicators to determine if a correlation exists between ESD and a cleaner physical environment in Finland. The study's results indicate that increased environmental consciousness through ESD does not completely correlate to a cleaner physical environment. Two of the environmental indicators, total CO[subscript 2] and greenhouse gas emissions from household fuel combustion, reduced after the United Nations Decade of Education for Sustainable Development (DESD); however, it could not be determined if ESD or government policies are responsible for these reductions. The other two environmental indicators, municipal waste and electricity consumption, increased post-DESD. This study concludes by recommending that ESD be institutionalized in teacher education programs alongside ecopedagogy throughout the Finnish education system.