Leif Koch undertakes a precise analysis of the political communication of the organization Greenpeace. Using a regulation from the European Union on chemical regulation (REACH regulation), he focuses on the question of how effectively this environmental policy actor can exert influence through lobbying. After outlining the policy field and its actors, he identifies the communication and power potentials as prerequisites for influence. The degree of lobbying success is determined by examining the individual phases from the adoption of the regulation proposal to the final REACH regulation, relating the lobbying actions of Greenpeace and other environmental policy actors on one side, and the numerous lobby actors from the chemical industry on the other.