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This is Climate One. I'm Greg Dalton. Cars and trucks are moving from gas and diesel to electricity,

but displacing oil is harder in the sky.

We might see some short-haul electric flights over the next decade or so, maybe some hydrogen,

but really there are fewer options that don't rely on liquid fuels. One promising area is

sustainable aviation fuels made from a variety of sources.

It's a readily available technology, and it's something we can do now.

It works well with the existing airframes that are here for a long period of time, and it works with much the existing infrastructure.

So why aren't we seeing this technology used more widely?

There will always be airlines that are leading by example

and blending sustainable aviation fuel.

And there's others that will probably never choose to do so

if it's not obligated because it is an added cost.

Will sustainable aviation ever take off?

Up next on Climate One.

For those of us who love to travel, climate guilt can weigh pretty heavily. Civil aviation

accounts for about 3% of global greenhouse gas emissions, and that number is going up.

But while electrifying other forms of transportation is already in progress, flying

...