Deforestation is an important problem all over the world. Unfortunately, as soon as, people`s needs increase, measure of deforestation rises too. As urbanization develops, this needs more and more lands. The number of newly planted trees is increasing every year, but common quantity of them is the least part of that our planet really needs. Why forests are so important? Firstly, they cover about 30% of the world and provide environment for animals and livelihoods for people. Secondly, trees are important components of an eco-system, absorbing carbon. Amazon forest produces about 20% of oxygen in the world. Third, forests provide protection reservoirs, prevent soil erosion and mitigate climate changes. As a result, deforestation has lots of negative effects for environment, as: deforestation leads to disappearance of wild animals and rare plants – expected, that by the next quarter of century about 28000 species might disappear. deforestation has a negative effect to the water cycle.