Preface

Abstract

First, our continues pray is directed for victims of flood in Sumatra, Indonesia. Indonesia is in the mourning due to the recent flood in November 2025 in many areas in Sumatra (Aceh, North Sumatra, and West Sumatra provinces), causing many people to lose their houses, belongings and even many lives. We pray for the victims in order they can be recovered soon, either by Indonesian government, the companies which have deforested large areas of Sumatra or ourselves who can contribute financially through organized donation. We hope that this disaster can become a warning and lesson learned about the danger of deforestation to prevent further disaster in some other areas of Indonesia. There are advantages of having wood from the forest and from the mining. However, the danger of deforestation to take these advantages is greater and therefore, it is recommended to leave the forests as they are to protect many lives!