Recent comments in /f/Futurology

longleaf4 t1_je10fgu wrote

It seems like an inability to consider conflicting thoughts and the assumption that current knowledge is the pinnacle of understanding is a kind of arrogant way to view a developing field that no one person has complete insight to.

To me it seems kind of like saying Fusion power will never be possible. Eventually you're going to be wrong and it is more ofna question of when pur current understanding is broken.

The AI claim is that a breakthrough has occurred and only time can say if that is accurate or overly optimistic. Pretending breakthroughs can't happen isn't going to help anything though. It's just not a smart area to make a lot of assumptions about right now.

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wheelontour t1_je105fr wrote

hydrogen contains a lot of energy per kg but its density is extremely low, so you need a huuuge and heavy high pressure container to hold it. That mostly negates all its advantages, at least for the aeronautics industry and the contemporary space industry.

It would be a different story for spaceflight if one had the capability to fuel up a hydrogen rocket in orbit. In that case one could (mostly) take full advantage of all the benefits of hydrogen over other propellants.

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DrMux t1_je0x9x9 wrote

It depends on how it's generated. There are a few methods, each with its benefits and drawbacks. These are referred to as the "colors" of hydrogen generation.

  • Green Hydrogen is produced by electrolysis. Obviously for this to be eco-friendly it needs to be powered by renewable sources - currently, as renewables are a growing sector, some argue that those sources would be better used for directly powering the grid, or other uses like carbon capture, etc. I'm not here to say which is actually the best use of renewables, just what some of the arguments are.

  • Blue Hydrogen and Grey (or brown or black) Hydrogen are produced from fossil fuel sources like natural gas (grey) or coal (brown/black). This process produces CO2 as a byproduct and can either be captured and sequestered (blue) or not (grey, brown, black).

  • Other methods include "turquoise" hydrogen which uses pyrolysis, and produces solid carbon which can easily be sequestered, and "pink" hydrogen which uses a nuclear power source to perform electrolysis.

EDIT: It may also be considered a bad fuel source because it needs to be stored at high pressure, which presents engineering challenges and can be dangerous (obviously, hydrogen is highly combustible. The Hindenburg used hydrogen to stay afloat and look how that worked out). I think there are also concerns about its energy density vs other fuel sources but I don't know as much about that.

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Ethanator10000 t1_je0wrhz wrote

Generating hydrogen with electrolysis (using electricity to decompose water into Hydrogen and Oxygen) is energy intensive, and most is created with fresh water, and this could create another resource scarcity issue. However, seawater electrolysis is being researched and it looks like a breakthough was achieved at the end of last year.

If the electricity used for this does not need to be stored for later use (unlike an EV), then it is more efficient to use it immediately (solar and wind farms often need to store the energy they generate during off peak hours for peak usage hours).

If the electricity used for this process is generated with fossil fuels, then it is more efficient to just use fossil fuel combustion directly for energy instead of first generating electrical energy, then storing that energy in hydrogen through electrolysis, and then re-releasing it with hydrogen combustion. Or, if hydrogen gas is really needed for some reason then it can be synthesized with processes that use the fossil fuels directly.

TLDR is energy is lost from the inefficiency of energy transformation which is needed to generate hydrogen.

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mancinedinburgh OP t1_je0w2kr wrote

It’s not that it’s a bad fuel source but it seems to be very hyped and currently not very economical nor is it as safe as other fuels (highly flammable etc). In order to accommodate it, other prototype aircraft have had to remove space for passengers because of the size of the fuel cell required, for instance.

I would be the first to say that I am open to persuasion and am by no means as well educated on it as I could be so always happy to be directed to reliable sources of info.

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Cerulean_IsFancyBlue t1_je0upng wrote

An AGI would be an amazing feat.

The first AGI will be the equivalent of a human baby, completely helpless. It will likely use a massive array of computer hardware backed by a tremendous amount of electrical generation power, and even if it wanted to duplicate itself, will not be able to do so rapidly or without detection.

If anything, it will be even less able to survive on its own, than a human baby.

All the ideas we have about being unable to control an AI, are using Hollywood level ideas about what things are Hackable and controllable. It could thrash around and mess up a lot of systems. There’s a pretty good chance in the process that it would suicide. Every model we have for an AI right now, requires a tremendous amount of computing, power, electricity, and cooling. It’s not going to be able to run away and hide in “the internet”. If it does, it will probably contract a fatal disease from half the computers it tries to occupy.

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FuturologyBot t1_je0pnpn wrote

The following submission statement was provided by /u/mancinedinburgh:


I’m still not convinced of the merits of hydrogen as an effective, eco-friendly fuel source but could it be any worse than the current fuel used by long haul carriers to fly aircraft halfway across the world? We’re moving towards futuristic aircraft like this (perhaps not for several decades) but by the time it’s in service, we may have found a better fuel source.


Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/124snr0/the_swiss_hypersonic_hydrogen_jet_aiming_to_fly/je0l9z4/

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acutelychronicpanic t1_je0nzdb wrote

The current generation of AI does not use search to solve problems. That's not how neural networks work.

Go was considered impossible for AI to win for the reasons you suggested it is expected. There are too many possibilities for an AI to consider them all.

You misunderstand these systems fundamentally.

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