From the neologism of Haeckel in the 19th century until today, scientific ecology has evolved into a significant branch of the biological sciences with its own scientific tools and methods of analysis. Its development filled a gap in scientific explanation of environmental problems that arose after the industrial revolution. However, in recent decades, due to the great social interest in these issues and the development of environmental movements, there have been several misunderstandings about the subject of ecology, with many confusing its scientific dimension with the activist action regarding the environment.

This book presents, simply and concisely, the general principles of ecology for those who have no previous knowledge, and especially for educators involved in environmental education. At the same time, it presents Greek natural systems in the second part, with an emphasis on forests and wetlands.