The problems are mostly solved already. You wouldn’t use metals known for hydrogen embrittlement. Often times, you’d use something else, like HDPE or fiberglass that avoids this issue. Storage facilities can even be naturally occurring geological features, like salt caverns.

You would only use LH2 for specific cases, specifically where you are expected to use up the hydrogen quickly. But even this is changing, as self-refrigerating systems are being developed, allowing for very long-term LH2 storage.

We already can make hydrogen via electrolysis. This is a long-solved problem. Efficiency is not that relevant. The main limitation of batteries is that you simply cannot make enough of them. There are huge resource limitation problems. Meanwhile, hydrogen can be made from water and is effectively unlimited as a resource.

You can’t store electricity by itself. The problem we are facing is massive curtailment, i.e. massive overproduction of green energy that can’t be utilized. There needs to be way of storing it at a massive scale. There is no feasible way of storing that much energy in conventional batteries.

If you can acknowledge that hydrogen is needed for dense energy storage and grid-level storage, then you should realize that we will eventually have a huge hydrogen infrastructure, and production capacity to match. That will create very cheap green hydrogen, and will mirror what happened with solar and wind.

Cheap hydrogen alone will drive large-scale adoption of hydrogen cars, regardless of the popularity of BEVs. A lot of people will choose hydrogen cars (possible e-fuel cars too, since e-fuels can be made from hydrogen) simply because it is akin to an ICE-car in usage.

The other point is that battery production is not green and is very resource intensive. Hydrogen cars let’s you avoid that almost entirely. In the long-run, it will be pointless to care about efficiency when green energy becomes nearly free. That suggests hydrogen, not batteries, is the better idea.

You are very outdated on your understanding on fuel cell cars. We already have fuel cell vehicles with > 600km of range. Cost will soon be cheaper than fossil fuels.

You’ll make hydrogen from renewable energy. That is the point.

The same applies for home hydrogen storage too. Compressed hydrogen is good for months. Another option would be metal hydrides which apparently last a long time too. The problem is that you simply cannot power your house entirely with batteries alone.

Even in tank form, you can store it for months. It is not much different than CNG.

Large-scale solutions matter too. The utility companies can utilize such a thing.

Underground caverns can store it for years. This is simply not true.

You would store it as a pressurized gas in this scenario. You would only use liquid hydrogen in specific situations.

Hydrogen can be stored for years.

BEVs are still cars and create massive traffic problems. Cars are not guaranteed to be faster. We cannot all use cars for all of our transportation needs anyways, so alternatives need to exist regardless.

Humans burns calories all the time, even when resting. And you still need to exercise. Might as well power a real bike instead of a stationary bike. So this is a totally silly thing to worry about.

A cargo bike can go anywhere a normal car can go. An e-bike is many times more efficient than a car. The argument used in favor of EVs over ICEVs also applies to e-bikes over EVs.

I understand that it is a matter of degree. But that means accepting that the BEV is a compromise no matter what their boosters claim otherwise. And there is room for another level of compromise, where people get out of their cars and into something even greener. If people are to stay in their cars, then we might as well stop pretending to care about efficiency.

Many people need a change in lifestyle or livelihood to adapt to BEVs. It is hypocritical to claim that people can’t further adapt to bikes or at least e-bikes.

Cargo bikes exist too. You can carry significant cargo with them.

Millions, sure. But that’s still a niche.

It’s important to note that the car itself is a luxury or extravagance. The most practical form of a car is a bicycle, which most people don’t want. So inevitably, cars always become a way of showing off capacities that you don’t need. Cars with any kind of deficiency get weeded out, simply because they can’t show off those extra capacities. And battery cars have something like that. People will move away from them specifically they can’t do things like crossing the Outback.

I did not say you can’t have battery cars. It is just a limited technology and would likely shrink to a niche market without subsidies.

Round-trip efficiency is not that important. If it really was as important as claimed, we wouldn’t be talking about cars at all. It would all be about bikes, buses, trains, walkable neighborhoods, etc., instead. But in the real world, we will need to accept less-than-perfect solutions. So as long as the idea is green, it should be tolerated.

We also have far more renewable energy available to us than we could ever hope to use. It is orders of magnitude more plentiful than fossil fuel energy. As a result, there will be an overabundance of green energy in the long run. It is fine to use that excess of energy to make stuff e-fuels or hydrogen.

Most of your claims are just climate change denial arguments. Many of them were directly made up by the fossil fuel industry.

Electricity has gotten dramatically more expensive too. It is no panacea. In all likelihood, most of transportation will shift over to either green fuels (e-fuels) or hydrogen. Those are one-to-one replacements for fossil fuels.

It is almost certainly greener than using more fossil fuel. This is an idea that should be explored.

It is a huge greenwashing exercise in reality.

Those are outright lies. For one thing, you can use fuel cells instead of gas turbines, getting rid of NOx emissions entirely (not to mention you can filter out NOx even with gas turbines).

Sorry, but this conversation cannot continue if you proceed with dishonest arguments.