Forests are important and we must protect them. First of all, forests harbour a vast amount of biodiversity. It concentrates a very large number of species, which take advantage of the unique environment offered by the variety of plants that coexist. The primary role of the forest is therefore to serve as a breeding ground for a varied and unique fauna. It is also fascinating to see the balance that can reign in these forests: they are all unique, with their own fauna and flora, and where certain species help each other to survive. This role is in some ways in danger today: massive deforestation in certain areas of the planet is weakening ecosystems and leading to the disappearance of many species. Then, forests act as oxygen generators and carbon dioxide traps. Through photosynthesis, in the presence of light, plants overall capture CO2 and release oxygen, which is essential for life on Earth today. This role is now essential to limit global warming. It is not the solution, but it has a significant weight in the equation.