Just one more invention to save the world

Americans have invented:

In 1731 the Sextant, in 1784 Bifocal Glasses, in 1794 the Cotton Gin, in 1801 Steam-Powered Pumping Station, in 1803 the Spray gun, in 1805 Self Propelled Amphibious vehicle, in 1805 the Refrigerator, in 1806 the Coffee pot, in 1818 the Profile lathe, in 1831 Reaping machine, in 1833 Sewing machine, in 1834 theThreshing machine, in 1836 the Revolver, in 1836 Combine Harvester, in 1837 the Telegraph Machine, in 1837 Power Tools, in 1840 Paint Tube, in 1842 Ether Anesthesia, in 1843 the Mechanical Refrigerator, in 1846 Cylinder Printing Press, in 1849 Safety Pin, in 1857 Passenger Elevator Safety System, in 1858 Burglar Alarm, in 1859 the Oil Well, in 1860 the Water Tower, in 1860 Repeating rifle, in1861 the Modern Pin Tumbler Lock, in 1863 Roller Skates, in 1865 Web Offset Printing, in 1867 Typewriter, in 1867 Motorcycle(aka Motorbike), in 1867 Barbed Wire, in 1867 Toilet Paper, 1870 Pneumatic Subway, in 1875 Electric Dental Drill, in 1873 Blue Jeans, in 1875 Mimeograph, in 1877 the Telephone, in 1879 Incandescent Light, in 1879 the Cash Register, in 1880 the Hearing Aid, in 1881 Maxim Gun, in 1882 the Electric Fan, in 1882 the Electric Iron, in 1882 the Fountain Pen, in 1885 the Skyscraper, in 1886 Coca-Cola, in 1887 "Platter" Record, in 1888 the Camera, in 1888 the Revolving Door, in 1891 the Escalator, in 1891 the Ferris Wheel, in 1892 the Tractor , in 1896 Automatic Hat, in 1897 Cotton Candy (aka Fairy Floss), in 1896 the Zipper, in 1901 the Safety razor, in 1901 the Assembly Line Production, in 1902 the Air Conditioner,in 1903 the Aeroplane, in 1903 Crayons, in 1905 Windshield Wipers, in 1905 the Popsicle (aka Icy Pole), in 1908 Tea Bags, in 1911 Self Starter, in 1921 Wirephoto, in 1921 BAND-AID, in 1923 Masking Tape, in 1924 Gas Chamber Execution, in 1927 Bread Slicer, in 1928 Bubble Gum, in 1929 Frozen Food, in 1930 "Scotch" Tape (aka cello tape, sticky tape), in 1930 Bathysphere, in 1930 Chocolate Chip Cookie, in 1931 Radio Astronomy, in 1935 Parking Meter, 1937 Chair Lift, in 1937 Photocopier, in 1938 Nylon, in 1942 Defibrillator, in 1944 Aerosol Spray Can, in 1945 the Microwave Oven, in 1946 Carbon Dating, in 1947 Cellular Phones (aka Mobile Phones), in 1947 Polaroid camera, in 1947 Scrabble, in 1950 Disposable Diaper (aka Nappies), in 1953 Heart-lung machine, in 1953 Apgar Scale, in 1955 Nuclear Submarine, in 1957 PolioVaccine, in 1959 Integrated Circuit, in 1960 Oral contraceptive, in 1960 Laser, in 1964 Operating System, in 1965 Minicomputer, in 1970 Optical Fiber, in 1972 Calculator, in ,1974 Product Barcode, in 1979 Human-Powered Flight, in 1981 Space Shuttle, in 1982 Artificial Heart, in 1983 Internet, in 1988 Graphic User Interface, in 1990 Hubble Telescope, in 1994 Top quark, in 1995 Galileo (spacecraft), in 1998 Stem cell line, in 2000 Human Genome Project, in 2003 Wilkinson Microwave Anisotropy Probe, in 2004 NASA X-43, in 2004 Spirit Rover, in 2006 Cervical Cancer Vaccine and etc.

So why the hell can't we invent a car that uses an environmentally friendly fuel such as hydrogen, that will be competitive with the low cost of oil, and will allow us to never again have to purchase cheap oil from thug dictator nations. Why???? Tell me why!!!