Name: Will zero emissions aviation ever take off? | Rethink Sustainability
Uploaded: 2021-04-22T22:27:22.000Z
Duration: 3 min 16 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Relative clauses (Restrictive vs. nonrestrictive)

If you had come up with a catchy statement that summed up

It's not pie in the sky, but it's definitely going

Aviation is one of the hardest sectors to decarbonise.

have decided they want to be net zero by 2050.

By far the biggest factor when it comes to emissions

is how you power one of these through the air.

There's nothing more efficient or economical than jet fuel.

And by 2050 we're expecting 10bn passengers

Electric aviation has caught lots of people's imagination.

The problem is simply that the batteries are still too heavy.

can't pack the aircraft with very many passengers.

So when it comes to bigger aircraft and longer trips,

These are fuels that are made from feedstocks

that can range from plants to used cooking

are two to four times the cost of jet fuel.

has grounded the majority of the world's commercial aircraft,

airlines simply can't afford to pay that extra cost.

The second options are synthetic fuels, which are artificially

KLM actually recently completed a flight using synthetic fuels.

But they are very expensive and very energy intensive.

One massive advantage of both biofuels and e-fuels

is that they can be just dropped straight into the tanks.

Minor adjustments, just tiny tweaks the engines.

You don't have to change the fuel supply system.

One thing to remember about these drop-in fuels

is that they do emit carbon when they're burned.

The advantage is that they only release the carbon

that they've already taken out of the atmosphere.

So they're what's called net zero, not true zero.

is hydrogen. It's got three times the energy

The problem is that its volume is four times bigger.

might be better suited to shorter flights.

is that it would require trillions in investment.

Investment in new aircraft, in fuel storage systems,

in fuel distribution systems, and in production itself.

These sustainable aviation fuels will cost more.

Even the industry says it will be a very tough challenge

So we the passengers have a choice to make.

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Will zero emissions aviation ever take off? | Rethink Sustainability

massive

tough

pandemic

majority