Since its launch in 2004, the policy of clusters contributes to boosting innovation and the construction of a genuine industrial sectors. The Grenelle of the Environment has confirmed that the protection of the environment is an investment opportunity generating growth and jobs both nationally and internationally. The Government has implemented a green growth policy with the objective of environmental challenge to a growth opportunity for French companies. Investments are expected to generate, by 2012, an activity of over 450 billion and 600,000 jobs (1). The clusters make a major contribution to this dynamic.