Airlines have pledged carbon-neutral travel and use of alternative fuels to reduce pollution. Electric airplanes also raise hopes for green air travel. But how close are we really to guilt-free flying?
Gleaming airplanes have been returning to the empty blue skies above 30,000 feet in recent months, opening up travel possibilities as they skim the clouds on their way towards unfiltered sunshine.
Numerous airlines have already pledged to offer carbon-neutral travel and explore alternative fuels to reduce pollution. Developments in electric airplanes, though still a distant possibility for long-haul flight, have also raised hopes for green air travel.So how close are we to guilt-free and genuinely low-impact flying?
Sustainable fuels, made from materials such as wood residue deposits, tobacco or sugarcane, can already be used in many of today's newer jet engines without any modification. Over its life cycle, sustainable aviation fuel reduces up to 80% of greenhouse gas emissions compared to fossil jet fuel use. And that's why its deployment is key to reaching the 2050 targets.
Several airlines operate their own. Cathay Pacific says its Fly Greener program has offset over 160,000 tonnes of CO2 since its launch in 2007 -- the equivalent of 30 million taxi journeys between Hong Kong International Airport and downtown. Europe's biggest airplane maker, Airbus, is betting on hydrogen to change aviation's trajectory for short- and medium-haul flight.
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