Do you have a green roof?

I wish we have a green roof. It will help us save the earth and it will give the house a cool atmosphere. =D

I haven't noticed what the color of our roof is since i have never been to it. I am living on an apartment and one thing I have never been to is the roof of our apartment. I think that is a good idea to make the roof green to reduce global warming. But I see many high rise buildings are starting putting green plants on their roof decks too I guess they are also conscious about it too.