Aviation Emissions Problem

Aviation is one of the larger contributors to greenhouse emissions in the world, and that includes Military and Civilian sectors. The amount of fuel burned per hour on some of these military fighter jets alone is mind boggling and eye opening. Why have we not come up with a clean cut solution in a more timely manner to stop, or even rapidly slow the rate of emissions being expelled into our atmosphere? One way we can start to go about this problem, is by using more SAF (Sustainable Aviation Fuels), which are fuel sources that are derived from renewable materials. SAF can include fuels of biogenic origin, fuels from hybrid feedstocks, liquid hydrogen, recycled carbon-based fuels, and electro-fuels." (Reichmann, 2021). These can be more sustainable than jet fuel in the future if we can just come together and come up with a solid plan to incorporate these fuels more and more into the scheme of things. As it stands right now, the blend ratio of fuel to SAF is 50-50, according to ASTM. Airlines in the future hope to get this blend ratio up to 100% in the near future, because when blended, these SAF's have the same characteristics as the jet fuel we normally use. But at the same time, the reason why the blend ratio is only at 50 percent right now, is because the supply of SAF is really low and takes more time to procure. 

Reference: 

Kelsey Reichmann, 2021. The Front Runner to Addessing Aviation's Emissions Problem: SAF. Retrieved from: https://www.aviationtoday.com/2021/06/01/front-runner-addressing-aviations-emissions-problem-saf/