We analyze the environmental implications of basic income programs through literature review, government documents, pilot studies, and interviews eliciting expert knowledge. We consider existing knowledge and then use a grounded approach to produce theory on the relationship between a basic income guarantee and environmental protection/damage. We find that very little empirical or theoretical work has been done on this relationship and that theoretical arguments can be made for both positive and negative environmental impacts. Ultimately, this implies, the environmental impact of a basic income program will be dependent on program design. These insights allow us to generate a toolkit of policy proposals to assist in the development of green basic income programs via either conditions, additions, or complements.