Some environmental subjects are integrated in courses on natural sciences and on health and healthy lifestyle. Manuals were developed on Biodiversity, Man and Earth, Man and Air, and on Water as Source of Life for use by pupils of levels 5 to 9 as supplementary learning materials. In 2005, a methodological guidance on Environmental Education in Primary School was developed. In 2009, a manual on Man and Nature was published for teachers of levels 5 to 9. The SCNP published several manuals on environmental topics for preschool educational institutions and schools.