The aviation industry has seen tremendous growth over the past few decades. As air travel has become more affordable and accessible to the masses, the number of flights and passengers have risen exponentially. In 2019 alone, over 4.5 billion passengers flew on commercial airlines around the world. However, this rise in air traffic has also led to a significant increase in carbon emissions and other pollutants from jet fuels. Commercial aviation currently accounts for around 2-3% of global carbon emissions and this percentage is projected to rise further as air travel continues to boom. The sector came under scrutiny by environmental groups and regulators regarding its contribution to climate change.
Transitioning to Sustainable Jet Fuels
To reduce aviation's carbon footprint, the industry has been exploring technologies and policies to transition to more sustainable jet fuel alternatives. Sustainable Aviation Fuels (SAF) are produced from renewable, lower-carbon sources like biomass, municipal waste, agricultural residues etc. through various conversion processes. They have almost identical properties as conventional petroleum-based jet fuel but result in significant lifecycle greenhouse gas emissions savings of up to 80% depending on the feedstock and production pathway used. Major airlines and airports have been at the forefront of testing and scaling up the uptake of SAF through technology demonstrations and purchasing commitments. The commercial availability and blend rates of Sustainable Aviation Fuel are still quite limited due to high production costs compared to petroleum-based jet fuel. However, supporters argue that with further R&D and economies of scale, sustainable jet fuels can play a key role in decarbonizing aviation.
Challenges of Scaling Sustainable Jet Fuel Production
While SAF holds promise to reduce aviation's carbon impact, there are still major challenges involved in ramping up global production capacities. Sustainable jet fuel production pathways require large capital investments and face technical challenges in terms of yields, efficiencies and integration with existing fuel infrastructure. The availability of low-cost, sustainable feedstocks on a large scale also needs to be ensured for commercial viability. Current tax policies and subsidies still favor fossil jet fuel production over renewable alternatives. Significant policy support from governments through mandates, incentives as well as offtake agreements from airlines will be critical for sustainable jet fuel industries to attract long term investments. Technical and political cooperation between all aviation sector stakeholders would also be needed to harmonize fuel certification standards and scale up best practices. Overcoming these challenges in a timely manner will determine if SAF can live up to its potential as a mainstream low-carbon solution for aviation.
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