The aviation industry, seen by many as one of the worst offenders when it comes to carbon emissions, is being pressured to find new ways of going green.
Although aeroplane-makers claim that they are building aircraft that are more fuel efficient than ever before, their models still emit huge amounts of carbon.
Airbus says that it is leading the charge to find cleaner alternatives to standard aviation fuels, but environmental activists say the claims are little more than hype.
Al Jazeera's Dan Nolan reports from Dubai.
