This paper examines contemporary ecclesiology as a postmodern phenom-enon with implications for leadership on environmental issues. Specifi-cally, it raises the question as to whether church-based efforts to engage society more broadly on environmental issues can be seen as an emerging movement within institutional faith communities, or as the church mere-ly reflecting contemporary societal attitudes about environmental issues. It continues with a discussion of what “being church” means in terms of future church practice in providing leadership on environmental steward-ship. From a theological standpoint, the paper suggests that the “cosmic Christ” has potential to allow ecumenism on environmental issues across denominations. Finally, the paper suggests ways to integrate the ecclesio-logical and theological views with various recommendations for ecumeni-cal church governance on environmental issues.