An Taisce is a non-governmental organization that works to preserve and protect Ireland's natural and built heritage. An Taisce is a charitable voice for the environment and for heritage issues. Its work is focused in three areas: advocacy, properties, and education. The organization's Advocacy Unit is dedicated to promoting the conservation of Ireland's nature and biodiversity as well as its built heritage. An Taisce owns a range of heritage properties in trust, including historic buildings and nature reserves. Their Environmental Education Unit is responsible for developing and operating some of Ireland's most popular and successful environmental programs and campaigns.