As times are changing, people's concept of life is also changing and their environmental awareness keeps strengthening. This tendency is reflected in the tiny watches used for timing. If the water-powered clock will amaze you, then the even stranger fruit-powered clock will surely catch your eyes. These green and environmentally friendly tools for timing integrate modern technology with the potential of nature itself. They not only satisfy the need for timing but also meet the requirements of energy saving and environmental protection. Below are the ten coolest clocks. It should be noted that these clocks have appeared on the European and American markets and it seems that there are no signs of them domestically yet.