The three main reasons why hydrogen cannot help air transport to contribute to meeting the 1.5°C limit of the Paris Agreement. 💧✈️❓

A short thread. ⬇️

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1. Hydrogen planes will come too late

Airbus says hydrogen aircraft will be available in 2035 - perhaps. Maybe it will take longer, maybe shorter.
But the fact is: we need to start reducing emissions today, not in 2035. And air transport must contribute to this!

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2. There are no regulations to push out kerosene-powered aircraft

Airlines need reasons to switch to substitutes for fossil kerosene. But the international climate rules for aviation are shamefully weak and don’t encourage emissions reduction

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3. Producing hydrogen requires enormous energy amounts

We need to think carefully about where we use valuable renewable energy, because its production also has environmental impacts. An activity which is mainly used by a privileged global minority might not be the best option.

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@stux @fruechtchen @StayGrounded_net You know what happens if we reduce air travel? It *increases* global warming. We observed this on 9/11 after the flights were grounded. The albedo cooling effect of contrails actually reflect heat back out to space during the day and hide the truth of how much damage we've done. Until we find a way to absorb enough carbon from the atmosphere we need to keep planes flying.

@feld @fruechtchen @StayGrounded_net Hmm.. You cannot tell me that the amount of sunlight reflected makes more difference overall then all air polution they produce..

It would contribute for sure but that's not a 'solution'. It's just going down the path we are now and that leads to hell, at least for our children and after that. Planes should fly yes because people need transport but in a FAR better way than we do now.

@stux @fruechtchen @StayGrounded_net I don't think it's completely settled science but it's not made up

> About a year after the attacks, Carleton, David Travis, a geographer at the University of Wisconsin, and another colleague argued in a paper that thin clouds created by contrails reduce the range of temperatures. By contributing to cloud cover during the day, they reflect solar energy that would otherwise have reached the earth’s surface. At night, they trap warmth that would otherwise have escaped.

here's the paper:

> In 2011, British scientists wrote that an air raid in May 1944 involving over 1,400 aircraft measurably lowered daytime temperatures in England. In that case, the situation was the reverse of 9/11 – large-scale air travel was unknown, and dense concentrations of large planes were rare.
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