Tandem Santiago Spanish school has renewed its membership at Fair Chile. The fair Chile seal certifies the member having contributed to mitigate CO2 emissions by planting 500 native trees in Chile , one for each foreign student of the school who uses an Airplane to come to Chile. Transportation of passengers produces carbon dioxide. Although the effects of this gas on our atmosphere are not entirely clarified, it is a reliable indicator of damage. To mitigate this damage we plant native trees in protected areas. Each adult tree transforms daily about 7 kg CO2 in wood, leaves and humus. FairChile is supported by the National park Service CONAF, the Universidad Católica del Maule and the ministry of the environment.