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as small as a diverse group of independent scientists say is possibly without impairing the function of the technology. the problem is, when we have for example the auto industry saying that cars can't get any cleaner, we have a wide sample of experts who say the contrary. it's a matter of looking at every part of the issue, and not just the extremists who are staunchly for / against whatever.

but what is the environmental impact of getting the hydrogen, what is the environmental impact of mining the metals for the car, what is the environmental impact of extracting the materials for the tires, what is the environmental impact of creating the roads to drive the damn thing on. and are all of these worth the little bit of convenience that a car would give you? and how do we as a horizontally organized society measure and agree on these things.

Of course it doesn't solve the problem, but it is a giant step forward, from what I'm getting. Hydrogen, being the most abundant element in the universe, would simply be in the air from what I'm getting, and the car would just have water coming out of it's tailpipe (literally).

Although, the metals would be much more complicated, although I'm sure we could easily recycle the same metal, which we only hear about on "Earth Day" nowadays. But anyways, seeing as engines and other forms of the same are what drives our societies today, it could far outmatch the output from wind, solar, or even hydro- electric power. It all depends on what is required for the process; of course, the companies are keeping this under wraps, so there is no way to know about the specifics of it, so the presence of this technology isn't certain either.

Point being, we could move whatever the hell we want, without having to cough up our black lungs or go and buy a "hybrid". Fact is, being an industrial society, our infrastructure depends on the use of engines and machines. With this, we could possibly still have this state, but cause relatively less harm to the environment.

As for metals and such, I'm sure there are many ways to create automobile frames with renewable materials that come from plants, like rubber or plastic for example. To organize our societies to be less harmful to the earth and self sustaining, we need to examine and jump at the opportunity of newer and more efficient technologies, while also limiting the use of those that poison ourselves and our planet for a daily commute to do more of the same. The future of modern society is in newer technology, as well as will to bring themto the point that machine is no longer at war with life.

Ah, you raise an interesting point, and one I didn't think of. Yes, in a sense, anything you use out of moderation could threaten sustainability. So also with new technologies, it would also be a good idea to try to create a lifestyle where few things would need to be produced to begin with. For example, instead of millions of hydrogen cars, just a public transportation system that runs on the same technology.

This applies especially to plants, and things like ground water. Both are "renewable", but if overused in a certain amount of time, the resource is exhausted. So as the saying goes, all things in moderation.