A. L. Barabási, Linked. How Everything is Connected to Everything else and what it means for Business, Science and Everyday Life, 2003.

J. Bertin, Sémiologie Graphique, 1967.

A. Bramwel, Ecology in the 20th Century: a history, 1989.

F. Capra, The Web of Life: A New Scientific Understanding of Living Systems, Colonial Waterbirds, vol.20, issue.1, p.152, 1997.

H. M. Collins, The Seven Sexes: A Study in the Sociology of a Phenomenon, or the Replication of Experiments in Physics, Sociology, vol.9, pp.205-224, 1975.

A. C. Diegues and . Santana, O mito moderno da natureza intocada, 2000.

H. E. Daly, J. Cobb, and . Jr, For the Common Good: Redirecting the Economy toward Community, the Environment and a Sustainable Future, 1989.

L. Freeman, Visualizing Social Networks, Journal of Social Structure, issue.1, p.1, 2000.

. Fruchterman, M. J. Thomas, and E. M. Reingold, Graph Drawing by Force-directed Placement, Software: Practice and Experience, vol.21, pp.1129-1164, 1991.

M. Bookchin, Ecology and Revolutionary Thought, Antipode, vol.17, issue.2-3, pp.89-98, 1985.

M. Jacomy, T. Venturini, S. Heymann, and M. Bastian, , vol.2, 2014.

, Continuous Graph Layout Algorithm for Handy Network Visualization Designed for the Gephi Software, PloS one, vol.9, issue.6, p.98679

M. E. Newman, Modularity and community structure in networks, Proceedings of the National Academy of Sciences of the United States of America, vol.103, pp.8577-82, 2006.

A. Noack, Modularity clustering is force-directed layout, Physical Review E, issue.2, p.79, 2009.

C. Koppes, Efficiency, Equity, Esthetics; Shifting Themes in American Conservation, 1989.

, The Ends of the Earth: Perspectives on Modern Environmental History

B. Latour, Politiques de la nature: comment faire entre les sciences en démocratie, 2004.

. Lash, . Scott, . Szerszynski, . Bronislaw, and B. Wynne, Risk, Environment & Modernity: Towards a New Ecology, 1996.

A. Lipietz, Qu'est-ce que l'ecolgie politique? La grande transformation du XXI e siècle, Les Petits Matins, 2012.

K. Lynton and . Caldwell, International Environmental Policy, 1990.

J. Moreno, Who Shall Survive, 1953.

H. C. Purchase, Metrics for Graph Drawing Aesthetics, Journal of Visual Languages & Computing, vol.13, pp.501-517, 2002.

D. Simmonet, L'ecologisme. Paris: PUF (Que sais-je?), 1979.

B. Shneiderman, The Eyes Have It: A Task by Data Type Taxonomy for Information Visualizations, 336_343 in Proceedings of the IEEE Symposium on Visual Languages, 1996.

J. W. Tukey, Exploratory Data Analysis, 1977.

E. Zencey, The organic societies, like anthills and beehives, are metaphors that project the natural environment in the technological social space, as well as the structure of neurons and cells are models for understanding the networked world. In fact, networks naturally reflect the (dis) organization of the universe and nature. In a forest, eg., ecosystems are organized in network" (Capra, 1996) ii Solutio problematis ad geometriam situs pertinentis, 1736. iii A simple look at the URLs of the subsequent tools reveals the efforts deployed to make networkmanipulation tools user-friendly and thereby available to a larger public iv « 'Rio+20' is the short name for the United Nations Conference on Sustainable Development which took place in Rio de Janeiro, Brazil in June 2012 -twenty years after the landmark 1992 Earth Summit in Rio. At the Rio+20 Conference, world leaders, along with thousands of participants from the private sector, NGOs and other groups, came together to shape how we can reduce poverty, Apocalipse now? Ecology and the perfidy of Doomsday visions, vol.31, pp.90-93, 1989.

, The websites that compose the corpus that we will analyze have been selected according to two criteria: 1. being issued by organizations and groups active on environmental issues

, 2. containing contents specifically related to Rio+20

. Cfr, Simonnet, 1979.

. Herber, Lash Et Al, 1964.

. Cobb, , 1989.