ENO started in 2000, The first four years were with mainly online activities. As many schools had problems with Internet we needed some activities offline. Then the idea of tree planting arose in 2004. The international day for peace was chosen as the first ENO Tree Planting Day and since then, every year ENO schools plant trees for peace around 21 September.

On 21st of September 2004, ENO tree planting gathered 50 schools in 30 countries. Tree planting made ENO more popular and next year over 200 schools joined.  Afterwards, another ENO tree planting day was organised around 22 May, the international day for biological diversity. Until the end of 2018, ENO Tree Planting Day has been organised 25 times. The photo is from India last year.

The occurrance of ENO Tree Planting Days 2004 – 2018:

20 September 2013
21 September 2004, 2005, 2006, 2007, 2009, 2010, 2011, 2012, 2015, 2017,2018
22 September 2008, 2014

8 May 2013
18 May 2018
20 May 2011
21 May 2010
22 May 2009, 2012 2014, 2015, 2016, 2017