The Greens are the political group in which the support for the implementation of a basic income is stronger. Nevertheless, the reasons for that support are not always clear and quite often not related to environmental issues. For this reason, two different approaches to a green BI – environmental and ecological – are discussed in this article. The first could be part of a green growth strategy, whereas the second would require structural changes to the economic model, in support of (...) a post-productivist economy. Although showing some overlaps, these models are in conflict in some central aspects, such as the role of economic growth in promoting sustainability. For this reason, it might be incorrect to assume that an environmental BI is a step toward an ecological BI. We will focus on the green aspects as a consequence of implementing a BI and independently of its sources of funding – namely by looking into the amount a BI needs to be in order to support shifting activities from the market to the autonomous sphere – and on the green potential of its sources of financing. (shrink)