Top eco-inventions: Your picks

(CNN) -- We asked you to send in what you think are the top eco-inventions of all time. Some are based on cutting-edge technology, some hark back centuries. We've compiled a gallery from your suggestions so far. Do you agree with what has been voted for? Is there something missing from the list of top eco-inventions that you think should be? Email us now at ecosolutions@cnn.com and let us know. E-mail to a friend