Environment Online (ENO) is a global network of schools and communities for sustainable development. Environmental themes are studied throughout the school year and campaigns are arranged simultaneously around the world. Over 10 000 schools from 150 countries have taken part in ENO activities, and have made concrete actions for the environment such as having planted 30 million trees so far.
In addition to schools, cities and municipalities have joined ENO Green Cities Network to support ENO schools.
ENO activities are coordinated and maintained by the ENO Schoolnet Association which is based in Joensuu, Finland. ENO has received many national and international recognitions.