1. Go into the forest. Take a cork with you.

2. Put the cork in a pot - so that most of it stands out. 3. Water it with a small amount of water every day, because too much water makes the taps rot. 4. After a while, a small tree will appear. 5.

Congratulations - they have just started producing oxygen and you have a piece of forest in your own home... You do something for nature, and you will see what nature does for you.