Thanks fallenangel, calibi and ox for the updates.
Italian article translated by google. The article mention Leo said this at an interview for magazine IO Donna, probably around the time he was promoting Revenant.
Leonardo DiCaprio: "The woman I marry will have to be ecologist"
Leonardo DiCaprio is an avid single, but if he ever decides to get married, his dream woman will have to be an ecologist. Very busy in the defense of the environment, the Hollywood star can not fail to share his vocation with the woman he loves.
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Beautiful and talented, Leonardo DiCaprio has been hurting hearts in recent years, winning top models and great actresses, all overwhelmed by his magnetic appeal. In addition to dedicating himself to a beauty routine that allows him to always appear at its best, DiCaprio is also an interesting and passionate man, like the one for the environment. The actor, in fact, stated that if she felt the desire to get married, the woman of his dreams should be an ecologist.
Love for the Environment: Leonardo DiCaprio puts the planet in the first place
After a number of interrupted sentimental relationships, such as those with Bar Refaeli, Gisele Bündchen and Blake Lively, the handsome Leonardo never lost their minds; indeed, his success with women is always assured, and he is often willing to dictate The conditions. His professional career, especially after winning the Oscar Prize as Best Actor of Revenant, is experiencing an explosive moment, but the actor does not lose opportunity to devote himself to the environment. His passion for ecology has become a true vocation, so that the Hollywood star has funded several projects dedicated to protecting the environment. For this reason, when thinking of a hypothetical marriage, DiCaprio emphasized that his dream woman would have to be a convinced eologist. During an interview with IO Donna, the actor talked about his love of the environment and the need to spread the information needed to understand how much the current lifestyle is not sustainable any longer. His attention to all matters relating to respect for the environment is not a way of passing, indeed: the actor has made this subject almost a second profession, becoming one of the activists who invests more money in projects geared to sustainability. For this reason, the woman who should be close to him for the rest of her life will have to share with him such strong motivations.