Plant a tree
The only "machine" in the world that can convert CO2 into oxygen are the trees. The more trees there are, the less CO2 is in the athmosphere, the less global warming we'll have. So it's essential not to destroy our trees, and to plant trees where they have already been cut. And trees are very important for the survival of many animal species.
With only 5 Euro, you can have your own tree. The Growing Air Foundation will plant a tree for your, with your name on it, and for five years, every year, you'll get a photograph by email showing how your tree is growing. With this money, you also contribute to poor families in rural Costa Rica, and generate some income for them. They will take care of your tree, keep cattle and fire away and make sure that your tree will grow and consume CO2.
How can you raise the money?
There are different ways how you can raise your money. For example
Bring old stuff from home, that you don't need any more, like books, old bicycles or clothes, and make a flee market.
Bake a cake and sell it.
Ask your neighbours or relatives to contribute to your tree. Make sure you''ll show them the pictures of your tree later.