4. Amazon rainforest

The Amazon rainforest encompasses a huge area of South America, from Brazil, Venezuela, Colombia, Ecuador to Peru. That is more than one billion acres of oxygen-producing, carbon-absorbing trees! However, Amazon deforestation is also very rampant and with that is the decline in flora and fauna as well as the destruction of indigenous communities living in the rainforest. Many species of plants and animals are endemic to these parts of the world. Most of them are critically endangered but haven’t been studied by scientists. Trees are systematically cut down to give way to human settlements, plantations, and infrastructures.