A significant and growing number of authors and commentators have proposed that ecologically enlightened (‘greened’) religion is the solution or at least a major part of the solution to the global ecological crisis. These include Birch, 1965 p90; Brindle, 2000; Callicott, 1994; Gardner, 2002, 2003, 2006; Gore Jr., 1992; Gottlieb, 2006, 2007; Hallman, 2000; Hamilton, 2006b, a, 2007b; Hessel & Ruether, 2000b; Hitchcock, 1999; King, 2002; Lerner, 2006a; McDonagh, 1987; McFague, 2001; McKenzie, 2005; Nasr, 1996; Oelschlaeger, 1994; Palmer, 1992; Randers, 1972; Tucker & Grim, 2000; and White Jr., 1967. Proponents offer a variety of reasons for this view, including that the majority of the world’s and many nations’ people identify themselves as religious, and that there is a large amount of land and infrastructure controlled by religious organisations worldwide. However, the most important reason is that ‘religion’ is said to have one or more exceptional qualities that can drive and sustain dramatic personal and societal change. The underlying or sometimes overt suggestion is that as the ecological crisis is ultimately a moral crisis, religion is best placed to address the problem at its root. ¶ Proponents of the above views are often religious, though there are many who are not. Many proponents are from the USA and write in the context of the powerful role of religion in that country. Others write in a global context. Very few write from or about the Australian context where the role of religion in society is variously argued to be virtually non-existent, soon to be non-existent, or conversely, profound but covert. ¶ This thesis tests the proposition that religion is the solution to the ecological crisis. It does this using a case study of mainstream religion in Australia, represented by the Catholic, Anglican, and Uniting Churches. The Churches’ ecological policies and practices are analysed to determine the extent to which these denominations are fulfilling, or might be able to fulfil, the proposition. The primary research method is an Internet-based search for policy and praxis material. The methodology is Critical Human Ecology. ¶ The research finds that: the ‘greening’ of these denominations is evident; it is a recent phenomenon in the older Churches; there is a growing wealth of environmentalist sentiment and ecological policy being produced; but little institutional praxis has occurred. Despite the often-strong rhetoric, there is no evidence to suggest that ecological concerns, even linked to broader social concerns (termed ‘ecojustice’) are ‘core business’ for the Churches as institutions. Conventional institutional and anthropocentric welfare concerns remain dominant. ¶ Overall, the three Churches struggle with organisational, demographic, and cultural problems that impede their ability to convert their official ecological concerns into institutional praxis. Despite these problems, there are some outstanding examples of ecological policy and praxis in institutional and non-institutional forms that at least match those seen in mainstream secular society. ¶ I conclude that in Australia, mainstream religion is a limited part of the solution to the ecological crisis. It is not the solution to the crisis, at least not in its present institutional form. Institutional Christianity is in decline in Australia and is being replaced by non-institutional Christianity, other religions and non-religious spiritualities (Tacey, 2000, 2003; Bouma, 2006; Tacey, 2007). The ecological crisis is a moral crisis, but in Australia, morality is increasingly outside the domain of institutional religion. The growth of the non-institutional religious and the ‘spiritual but not religious’ demographic may, if ecologically informed, offer more of a contribution to addressing the ecological crisis in future. This may occur in combination with some of the more progressive movements seen at the periphery of institutional Christianity such as the ‘eco-ministry’ of Rev. Dr. Jason John in Adelaide, and the ‘Creation Spirituality’ taught, advocated and practiced by the Mercy Sisters’ Earth Link project in Queensland.