Take some action and plant a tree today (or soon). Why not make it a family project? If every family (world-wide) planted one tree each there would be millions of extra trees helping keep down CO2 levels. Also helping counteract the effects of deforestation.
This action could help control CO2 levels for years. As the years go by you can watch your creation grow, and it can be apart of the family. Obviously this doesn't have to be a family only action, any one with some green space they have access to should be able to go out and purchase a tree and plant it. Every person's input helps.
So go on, get out there and plant a tree, you'll always have a place to come back to and at the same time help the planet, it's a win-win situation.