Slovenia

Beautiful lakes, atmospheric castles and deep forests combine to make a perfect backdrop for volunteering:

Society for the Promotion and Education for Health of Slovenia
http://www.drustvo-pvzs.si/ - Works for the common good and the preservation of the planet, protecting the climate, good water, quality of life and health.

Umanotera - The Slovenian Foundation for Sustainable Development
http://www.umanotera.org/ - Implements the principles of sustainable development in practice, particularly those aimed at preserving natural resources and biological diversity.