Environment Online- ENO is a global virtual school and network for sustainable development. Since the launch in 2000, over 10 000 schools in 157 countries have joined ENO and made concrete deeds for the environment like planted trees. Two annual tree planting days in ENO take place on UN Days, on 22 May for biodiversity and 21 September for peace. Tree planting for peace started 15 years ago and we are now celebrating the day especially this year! Theme for the day by UN will be Climate Action for Peace. This is what we have been doing since 21 Sep 2004.