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This paper analyzes the interaction between three environmental strategies within a population of firms: brown, green, and certified green strategies. We first present a restricted version of an evolutionary game where only brown and green strategies are possible. Next, the model is extended to allow green firms to certify their environmental strategies by joining an ecolabel. Our analysis shows that when it survives, the ecolabel tends to fully replace other uncertified environmental initiatives and to increase the proportion of firms implementing voluntary abatement. Nevertheless, the long-run survival of the ecolabel is not a necessary outcome of the model, although it can be facilitated via policies that reduce abatement or certification costs, increase consumer's environmental concerns or improve the credibility of the certifier, whereas it may be reduced by green-wash news about the sector. An ecolabel's survival may …