The tree is an oxygen producer, an air purifier and a source of life. Trees sequester CO2 in the atmosphere, then transform it and release it in the form of oxygen. In the Amazon rainforest, each hectare of forest stores 50 tonnes of carbon. By way of comparison, in the Mediterranean, a tree sequesters around 7 kg of CO2 per year while in the Amazon, a tree sequesters around 15 kg of CO2 per year.