Many thanks to Gabriella for sending in the link to this great project for children, starting by the nine year old Felix Finkbeiner. Here is a short paragraph from their website and a video of Felix talking about how the project begun:
The Plant-for-the-Planet Children´s Initiative was founded in January 2007. It has its origin in a school presentation about the climate crisis of the – back then – 9-year-old Felix Finkbeiner. Inspired by Wangari Maathai, who planted 30 million trees in africa, Felix developed at the end of his presentation the vision that children could plant one million trees in each country of the world to create a CO2 balance therewith. During the following years Plant-for-the-Planet developed to a worldwide move: At present approx. 100,000 children all over the world pursue this goal. They understand themselves as an initiative of world citizens which campaign for climate justice in the sense of total reduction of the emission of greenhouse gases and an homogeneous distribution of those emissions among all humans.
Check out Plant for the Planet’s website here