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1. What percentage of the world’s carbon dioxide emissions are airlines currently responsible for?
3%
2%
What is the predicted percentage of CO₂ emissions from airlines by 2050?
4%
3%
What is a biofuel?
A fuel made only from petroleum
A fuel produced from living matter
When were biofuels approved for use on commercial passenger flights?
2011
2008
2014
Which airline flew the world’s first commercial biofuel flight with passengers?
KLM
Virgin Atlantic
What type of biofuel was used on the first KLM commercial biofuel flight?
coconut oil
Used cooking oil
How many planes used biofuels during the 2014 FIFA World Cup in Brazil?
200
100
Why might algae become the main source of biofuel in the future?
It is likely more efficient or sustainable than oils
It is easier to transport than oil
Why was Virgin Atlantic’s 2008 flight significant?
It was the first flight to use only biofuel
It was the first flight partly powered by biofuel
What does the text suggest about the future of aviation biofuels?
They will never be used widely
They may eventually become normal for all planes
What does the phrase “in the early stages of development” imply about aviation biofuels?
They are more popular than conventional fuels
They are new and still improving
Did Virgin Atlantic’s first biofuel flight carry passengers?
Yes, 171 passengers
No, only pilots and technicians
