Corporate Social Responsibility (CSR) and advertising are strategic complements. If a claim about the environmental or social benefits of a product is unsubstantiated or mislead- ing, this practice is known as greenwashing (GW). The model clearly identifies some "usual suspects" that will prefer GW over CSR. We then carry out an empirical analysis using CSR data, economic data on the 500 largest European firms, and proxies for green com- munication to test the predictions. Several instruments are used to estimate the propensity to prefer GW. We show that "hard greenwashing", i.e. active communication with no CSR at all, is not always a credible strategy, and highlight the concept of "light greenwashing". It may have two dimensions: either it can be a response to the presence of greenwashing firms or it can be due to the simple possibility of advertising. Both possibilities are verified empirically, thus confirming the changing nature of greenwashing practices.