High bypass, quiet, clean running, fuel efficient engines are said to be one of the things that makes the Boeing 787 Dreamliner the most environmentally friendly airliner every produced. Boeing tells us that their Boeing 787 Dreamliner will be the most "green" commercial air transport in the world.
Modern compression technology makes the engines of the 787 approximately 20 percent more efficient, with less hydrocarbon pollution, than those on the aircraft the Boeing 787 will eventually replace, the Boeing 767.
Another reason the 787 aircraft is environmentally friendly is that over half of the construction materials used in the fuselage are made up of light weight, yet strong carbon graphite, secured with epoxy. This keeps the overall weight of the 787 down, permitting the engines to work more efficiently. The Boeing 777, in comparison, has a fuselage comprised of about 10% composites.
The wings of the Boeing 787 feature an ultra high aspect ratio making them more efficient at higher speeds, while flaperons enable them to produce more lift than the wings of the 767.
A welcomed feature for passengers is that the Boeing 787 uses electric pumps to maintain interior cabin pressure, rather than engine bleed air. Interior pressurization of the 787 will be at 6,000 feet rather than the 8,000 feet of other aircraft.
Another creature comfort of the 787 is that a higher humidity level can be maintained in the cabin, alleviating dehydration. Aircraft built with more corrosive materials in their fuselages have to keep their humidity at very low levels.
Boeing unveiled the Boeing 787 to the public at a ceremony at their plant on July 8, 2007. Its first flight is expected prior to the end of 2008.
RC Airplane from E-flite.