I am a time traveler and I just came back from the future. One of the most amazing inventions that I saw that has helped our planet are tiny little Filter Leaves. They are on all of the rooftops and are used to filter pollutants and excess carbon dioxide out of the air with micro-filters. Just like regular leaves, they produce oxygen as a bi-product. Not only are they useful, but they are also cool looking. Best of all they are solar powered!