Environmental responsibility, after Directive 2004/35/EC and the current Law on Environmental Responsibility, as well as Regulation that partially developed it, have provided the Spanish legal system of a solid support and an important weapons to prevent, anticipate and repair actions that produce, occur or might occur against the environment. Something, perhaps, in other areas of RSE has not happened so deep and demanding, sometimes staying on mere proclamations of principle. In fact, environmental responsibility and its profuse regulation are, both at European and Spanish level, the origin of today's modern concept of corporate social responsibility and the subsequent regulations issued about this last matter.