A ‘citizen’ is a member of society who undertakes duties and obligations. Authors define Ecological Citizenship (EC) as accessible activities and skills which establish sustainable practice(s) and/or address ecological inequalities. Unsustainable practices (and consequences) are not constrained to individual countries, single industries, or discrete societies. Our life-supporting ecosystems (for example, oceans we eat from and the air we breathe) are impacted by contemporary resource exploitation, pollution, material misuse and inadequate protection. We are (all) citizens of the world, with the natural environment sustaining all life on earth. Our human existence is intertwined with our environment; we live in and are ‘citizens’ of our environment. EC fosters positive, ecological behaviours involving and benefiting communities through individual and collective action(s). Infamous author Enzio Manzini advocates that designs' contemporary role and purpose is to ‘create the conditions’ to enact change. This position paper outlines transdisciplinary approaches in addressing environmental challenges that benefit; communities, industry, academia, and other species. EC draws on previous projects, contemporary literature, and multidisciplinary perspectives. The EC position is ‘post sustainability’, exploring practices mitigating consequences and ‘desiloing’ expertise. EC offers; new research topics, supports tangible public roles, all within contemporary sustainable challenges. This position paper offers signposting to enable community and public(s) agency, challenging hegemonies rather than adopting conventional practice(s).