Seeweed-powered supersonic airplane

Aero planes are the fastest means of travel but on the other hand it’s a major contributor to air pollution. But imagine travelling 3 times faster than the airplane which has zero emissions- offered by aircraft manufacturer EADS's Zero Emission Hyper Sonic Transport (ZEHST).    

A prototype was first unveiled in Paris Air Show last year and is due out in 2050. The high speed aircraft uses bio-fuel made of seaweed and has three engine types- jets, rockets and “ramjets” which is the supersonic version. It speeds the aircraft to 5000 kmph, which will significantly cut down the time. For a clear picture it will take you from Paris to Tokyo in 2.5 hours which now takes 11 hours.