I've read somewhere that a Japanese car company have calculated how much CO2 their cars give off and they make up for it by planting a tree for the amount of CO2 used. If anyone can give me the full details please let me know, I've been googling it and can't seem to find it.
Its great to see so many companies going the green route. I also see that Land Rover is doing some good for our environment:
Land Rover UK - Our Planet - Our Planet
They have an entire map filled with pins showing all the things that they are doing to improve their technologies and to help save the planet - our planet.