Plant a tree seed, save a planet

It's the smallest thing but possibly the grandest gesture you can do today... Plant a tree seed.

It can be a pip from an apple, an acorn from an oak or a winged nut from a maple - you can even go crazy and buy a whole packet of tree seeds from your local garden centre if you want. All you have to do is make sure they are the seeds of trees that found naturally - or "native" - to the place in which you live.

But where do you plant it?