Avoti tālākām studijām

Biogeochemical cycles. Pieejams: www.enviroliteracy.org/subcategory.php/198.html

Leopold education Project. Pieejams: www.lep.org/

World resources institute. Pieejams: http://materials.wri.org/topic_data_trends.cfm;

Anthropocene info Pieejams: http://www.anthropocene.info

World Resources Institute Pieejams: http://www.wri.org/

Anthropocene. Pieejams: http://www.eoearth.org/view/article/150125