Chile is a good destination for those that want to work abroad on farms. Permaculture institutions, organic farms or eco-villas offer environmental volunteer opportunities doing various tasks in exchange for a few hours of work. To get to know the ecosystems of Chile better, especially in the interior where most opportunities are, just apply for the spot that interests you the most and wait for a response from the host.
The exuberant Atacama Desert, the amazing Andes mountains, and the beautiful coastal beaches are what Chile is known for. For those interested in seeing these sights up close and off the beaten path, it's possible to do an exchange on organic farms or in eco-villas and learn more about sustainability. The tasks are along the lines of painting and decorating, planting, construction, and caring for plants and animals.