This paper offers a theological analysis of the World Council of Churches' (WCC) Ecumen-ical Decade of Climate Justice Action (2025-2034), interpreting it as a faith-based response to intersecting inequalities intensified by the global climate crisis. Engaging the conference theme Religion and Inequality, the study argues that the WCC's climate justice framework advances an eco-theological critique of structural injustice, revealing how ecological degra-dation, economic exploitation, and social marginalization are deeply intertwined both mate-rially and theologically. Climate change is thus understood not merely as an environmental emergency but as an ethical and spiritual crisis rooted in unequal power relations. Situating the Decade within the WCC's longstanding commitment to justice, peace, and the integrity of creation, the study explores how climate justice is framed not merely as an environmental concern but as a moral, spiritual, and socio-political imperative. The paper analyzes key WCC documents, ecumenical and inter-faith initiatives to demonstrate how Christian ecotheologies, indigenous spiritualities and the wisdom of diverse religious traditions are mobilized together, alongside the WCC stewardship, to address the disproportionate impact of climate change on vulnerable communities and on the rest of creation, especially the biodiversity. The paper further emphasizes interreligious dialogue and advocacy as central strategies for eco-justice, particularly through partnerships with Indigenous traditions and major world religions. By centering lived experiences from the Global South, the WCC challenges an-thropocentric and economically driven climate responses and calls for systemic transfor-mation grounded in solidarity, equity, and ecological sustainability. The implications of this initiative should influence contemporary eco-theological discourse and faith communities' solidarity in addressing the current ecological and ethical crisis.