It's in the works. Air travel is a major contributor to green house gas emissions. An alternative has been found:
Airbus is working on a Concorde-style design for a hypersonic plane capable of seating between 50 and 100 business travellers and flying at more than four times the speed of sound - more than 3,000mph - at 105,000 feet.
However passengers will have a long wait. An unmanned prototype is unlikely to be flying before 2020 and the first commercial flight could be another 30 years off but the hydrogen and oxygen fuelled plane will not leave a carbon footprint because Airbus says it will produce zero emissions.
The plane, named the Zehst - zero emission high speed transport - is being developed with Japanese partners. Airbus says all the necessary technology is in place but the development costs are said to be stratospheric.
From here:
http://www.telegraph.co.uk/finance/newsbysector/transport/8587485/Paris-Air-Show-sees-flood-of-plane-orders-despite-rain-swept-first-day.html
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