Every country in this world has its own traditional knowledge or perhaps philosophy with regard to environment conservation. Indigenous people in Indonesia practice ancient knowledge or live with a traditional philosophy to conserve their environment or to express their gratitude to mother of earth. Such this knowledge and philosophy are so wise and deep and still practiced today as way of life.

"Tri Hita Karana" is an essential philosophy that has long been at the heart of Balinese daily practice. It is a Sanskrit term that literally means "three paths to peacefulness and prosperity", and is about harmonious relationships with God (parahyangan), fellow human beings (pawongan) and the environment (palemahan). It does really have a big contribution in nature conservation in the island of Bali since 2000 years ago. Here is the list of several practice guided by Tri Hita Karana.

1. Subak

Subak is a system of sustainable irrigated rice culture. In traditional Subak system. Farmers still grow traditional Balinese rice without the aid of fertilizer or pesticides. This system keeps the harmony with nature by symbolically through rituals to preserve nature and biodiversity, cropping pattern and planting. Moreover, irrigation structures were built best suited to local environment, using local materials and local wisdom ensures fairness, transpararency and easy to monitor (appropriate technology).

2.   Nyepi

Bali has tradition of saving energy trough Nyepi Day (Silence Day). These values are the essence of nyepi, when families in Bali fast in silence, do without light and forego entertainment, seeking to restore the energy of the earth that has been used up over the previous year. The harbor and airport are closed for a day and no vehicles pass by the street. On that day CO₂ emission usually fall into 80% and electricity uses reduces at least 50%. It seems an appropriate moment to reflect upon the implications of tri hita karana, not only in the context of Bali but also in relation to worldwide efforts to combat global warming and preserve environment.

3.   Tumpak Wariga

Tumpek Wariga is the day to worship the god of vegetation, celebrated as ceremonial event of blessing trees with porridge and other offerings. The sacred ritual aims to remind people of how important plants are as their staple food source. Honouring and appreciating the plants, are the ways for humans to love nature and surroundings because humans cannot live without them. The celebration of Tumpek Wariga does not propose bali's nature only it celebrates the entire world's. Tumpek Uduh has been held for a long time, even before the emergence of awareness of preserving nature and the environment, before the beginning of earth day, before December was commemorated as the national month of tree planting.

4.    Tumpek Kandang

This is a day for honouring and appreciating domesticated animals.  This ritual certainly not an animal worship ritual, the Balinese consider the animal as a friend of life and fellow brother created by god as a living creature. Tumpek Kandang has additional meaning as a demonstration of evidence that the Balinese community is aware of animal welfare. This means there is an awareness of owing "merits" to the animal, since such creatures are the preservation and prosperity of the ecosystem. Without animals on earth, the life cycle will be interrupted.