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In the present market, palm oil seems indispensable from daily products such as food, cosmetics, biodiesel and energy. Because of its favourable physical and chemical qualities, low production cost and especially high yield per hectare, palm oil is become by far the most consumed and cultivated oil crop in the world. Nevertheless, palm oil production is linked to several environmental issues. A robust decrease in palm oil consumption is essential to prevent further environmental damage. The aim of this study is to examine the effect of knowledge on pro-environmental consumption behaviour (PECB) in the case of palm oil consumption. We distinguished between two different knowledge types, being consequence knowledge and action knowledge. To manipulate the knowledge levels, a knowledge-based intervention was executed. In this study we used a knowledge-based intervention consisting of four informational-posters which differ in the nature of information. The data have been collected with an online survey filled in by 138 participants. The findings show that consequence knowledge is proved to increase self-reported willingness to engage in PECB, where no evidence was found for action knowledge and interaction of the knowledge types.