This article, based on fieldwork, discusses the negative impacts of land alienation suffered by Adivasis in Attappady, a tribal block of Kerala in South India. Experiencing multiple alienations that have fundamentally affected their way of life, agricultural practices and food culture, tribals not only continue to suffer discriminatory treatment by non-tribal settlers, but also by state authorities' restrictions of access to local forests and forest produce. These problems assume added significance as this ecologically important location in the Western Ghats of India is one of the eight 'hottest hotspots' of biological diversity in the world, while the traditional guardians of this environment have been completely disempowered. The article traces abuses of power in land alienation processes, analyses unequal power structures and argues that better appreciation of traditional tribal culture and its ecologically holistic approaches ought to inform policies for local sustainable development. This would help the tribals to safeguard their identity within the constraints of current conditions and enhance the prospects for sustainable preservation of the precious local natural resources and biodiversity.