Environment Online- ENO is a global virtual school and network for sustainable development, currently in over 100 countries. This programme has organised annual tree planting events since 2004. ENO joined the successful Billion Tree Campaign by UNEP in the end of 2006. A pledge of 100 000 planted trees was easily reached for 2007. In 2008 we will plant one million trees. Schools can play a pivotal role in promoting environmental issues in their local communities. They can emphasize the importance of environmental protection and increase its awareness in the local communities. Children and youth are the ambassadors for the environment. We have currently only some hundreds of schools regularly involved in ENO. But our challenging goal is to plant 100 million trees by 2017 when Finland will celebrate its 100th anniversary. As our group is a tiny number of people who can make a difference, we kindly ask UNEP and all the tree planters in the world to follow our example and join our common effort to plant 100 billion trees by the end of 2017. There will be a dedicated website for this by July 2008.