QUOTE: Originally posted by jchnhtfd Toyomantrains has put the fundamental problem with hydrogen very well: overall cycle efficiency ('source to wheel') is the techical term. If your hydrogen source is water (the most plentiful) you cannot possibly (one of those dang laws of physics!) get more energy out (by burning the hydrogen or using it in a fuel cell) than you put in (by separating the hydrogen from the water). In fact, (another of those dang laws of physics!) you can never get as much out as you put in. Thus, if your source is a fossil fuel using facility, you will use more fossil fuel to move a given load a given distance if you use the energy to create hydrogen, and then burn the hydrogen, than you would if you burned the fossil fuel directly -- assuming that the engines burning the fossil fuel have similar efficiencies themselves, which they can. If you use the fossil fuel directly in a fuel cell system (the most commonly discussed is natural gas), the process still involves splitting the hydrogen off... the advantage of hydrogen as a fuel, and the only real advantage, is that it is a portable fuel which, in principle, can be used without creating much air pollution AT THE VEHICLE. However, if a fossil fuel is your energy source, the overall amount of pollutants will be slightly greater -- just produced in a different place. Hybrid vehicles -- particularly hybrid diesels -- have been shown (I regret I don't have the reference to the study immediately to hand) to have an overall cycle efficiency and pollutant mass equal to, or better than, any other means of using fossil fuels in transportation. But what if your energy source is not a fossil fuel? Such as nuclear, solar, or wind? Then the best approach is to use the electricity directly, for those applications such as electrified rail lines which can do so. Otherwise, with some loss of efficiency, you can use hydrogen with some advantages. Nuclear, solar, and wind all have some rather severe problems as energy sources, however. Solar and wind both take large amounts of land, and are not dependable for base power, as has been said before. In addition, construction of solar cells is not the most environmentally friendly process in the world. They have other environmental problems as well. Nuclear has some environmental problems, although the technology for handling waste is well understood and proven. The main problem with nuclear is political. As Big_boy_4005 said -- in large type! -- solutions to all of our problems exist. The question, however, isn't just 'can we find them' but also: are we willing, politically, to apply them?
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QUOTE: Originally posted by mehrlich I still think we're basing our ideas and answers here on known technology. In a generation of two they'll laugh at how inefficient we are now. Nuclear, magnets, guar, methanol(?)
I tried to sell my two cents worth, but no one would give me a plug nickel for it.
I don't have a leg to stand on.
Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.
QUOTE: Originally posted by toyomantrains As far as hydrogen goes (at least in the auto industry) Toyo has 'sidelined' this and put more of Its efforts into hybrids. The amount of energy required to produce the hydrogen needed to effectivelly produce power for an automobile negates the benefit gained- at this time. What I mean is dollar for dollar its much cheaper to burn fossil fuel (let alone the infrastructure cost of hydrogen refueling). It takes great amounts of energy to produce the hydrogen required which comes from coal or nuclear energy plants.
QUOTE: Originally posted by Allen Jenkins I look at global warming, like, If the Bible says burn, consumed with fire, as with fervent heat, and the event is in the future of the planIt, wouldn't there be something left to judge? How do you have a habitat that is not habitable? Why would God do that to Ma-maw? How can this happen to people, unworthy as they may seem, if He inspired the race to have His Christmas, His resurrection, "The Passion Of The Christ"? Don't you think that the One who called the creation into existance, using the provable, mathamatical, laws of physics, who has given to the "prudent, the knowledge of witty inventions", wishes we would worry about more pertinent things, like trashing the environment(garbage), thugs, would-be neighbors, who act far worse than the Talabon, who at least would send the enemy to be with his creater, not withstanding, really, not who is god, but whose god is God?
QUOTE: Originally posted by leftlimp QUOTE: Originally posted by vsmith FYI this Memorial Day a movie called "The Day After Tommarow" opens with a Global Warming disaster scenario that could actually happen. the premis is that melting fresh water from the north pole, disrupts, then shuts down the Gulf Stream in the Atlantic, causing weather chaos in the US and Europe, triggering another Ice Age. It will probably be full of Hollywood Schmaltz more than facts, but this is a real scientific possibility that has been discussed as a possible fallout from green house warming. Besides the trailer looks really cool... www.thedayaftertomorrow.com All I can say to those who use a second-rate Hollywood disaster flick or take a Pentagon "just in case" briefing (which by the way they also have for alien space attacks, giant asteroids, et al) as the basis for instituting radical environmental policy, take stock in two things: Re-read Chicken Little from your grade school days and ask yourselves if such an analogy is applicable today. Secondly, take a look at the historic temperatures of the MIddle Ages, which were much higher than they are today, and ask yourself what man did to cause THAT period of global warming?! If wine grapes were being cultivated in Britian in those days, why can't we grow grapes in Britain now? It's simple: THE AVERAGE TEMPERATURE IS STILL TOO COLD! Why is Greenland called Greenland? Because when it was discovered in the MIddle Ages it was verdant, i.e. GREEN! Now it is one giant ice cap. If man-caused CO2 is the major cause of Global Warming, where did the CO2 in the MIddle Ages come from? How many coal fired power plants were operating at that time? How many SUVs were clogging the byways of the time? Hmmmm. Maybe, just maybe, the warming of that period WASNT caused by man's burning of fossil fuels. If it was something else such as solar activity or slight deviations of the earth's orbit, isn't it logical to ascribe todays warming to those more likely phenomena? So what if 200 or so "scientists" have leapt on to the whole man-caused global warming bandwagon. There are well over 15,000 scientists worldwide who have resisted that urge, due to the inarguable fact that there is no hard physical evidence to support the whole man-caused global warming models. Look at the global warming computer models today and you will find a lot of "assumed" variables being plugged into these models used to support these radical theories. Hardly an excuse for instituting economically disasterous environmental policies. If we refer to our basic laws of physics, we will find that it is more likely that global warming is the cause of increased atmospheric levels of CO2, not the other way around. It's all part of the global carbon cycle, as temperatures increase, plant growth also increases, and these plants will need to take up more CO2 from the atmosphere for sustainability, thus more natural sources of CO2 are triggered. Back to the original subject at hand: If oil prices are projected to stay above $40 a barrel for the long term, look for market forces to allow for new coal powered locomotion in the transportation market, whether it be new steam or the stringing of new cantenary over the nation's rail grid.
QUOTE: Originally posted by vsmith FYI this Memorial Day a movie called "The Day After Tommarow" opens with a Global Warming disaster scenario that could actually happen. the premis is that melting fresh water from the north pole, disrupts, then shuts down the Gulf Stream in the Atlantic, causing weather chaos in the US and Europe, triggering another Ice Age. It will probably be full of Hollywood Schmaltz more than facts, but this is a real scientific possibility that has been discussed as a possible fallout from green house warming. Besides the trailer looks really cool... www.thedayaftertomorrow.com
QUOTE: Originally posted by leftlimp QUOTE: Originally posted by vsmith FYI this Memorial Day a movie called "The Day After Tommarow" opens with a Global Warming disaster scenario that could actually happen. the premis is that melting fresh water from the north pole, disrupts, then shuts down the Gulf Stream in the Atlantic, causing weather chaos in the US and Europe, triggering another Ice Age. It will probably be full of Hollywood Schmaltz more than facts, but this is a real scientific possibility that has been discussed as a possible fallout from green house warming. Besides the trailer looks really cool... www.thedayaftertomorrow.com All I can say to those who use a second-rate Hollywood disaster flick or take a Pentagon "just in case" briefing (which by the way they also have for alien space attacks, giant asteroids, et al) as the basis for instituting radical environmental policy, take stock in two things: Re-read Chicken Little from your grade school days and ask yourselves if such an analogy is applicable today.
Have fun with your trains
QUOTE: Originally posted by 440cuin What about garbage incineration, is that not soon possible to do clean and efficient and generate electricty from that?
QUOTE: Originally posted by 440cuin [What about garbage incineration, is that not soon possible to do clean and efficient and generate electricty from that?
QUOTE: Originally posted by garyaiki New Scientist is one of the 2 most respected peer reviewed science journals. They put together a portal www.newscientist.com/hottopics/climate/ with a FAQ www.newscientist.com/hottopics/climate/climatefaq.jsp it’s brief, here’s a sample: "So does this mean there are some scientists who don't believe in the greenhouse effect or global warming? No, this is a myth. All scientists believe in the greenhouse effect. Without it the planet would be largely frozen. And all scientists accept that if humans put more greenhouse gases in the atmosphere it will tend to warm the planet. The only disagreement is over precisely how much warming will be amplified by feedbacks. And there is a growing consensus that the average global warming of 0.6 °C seen in the past century - and particularly the pronounced warming of the past two decades - is largely a consequence of the greenhouse effect. " www.newscientist.com/hottopics/climate/img/spread-2-2.jpg is a graph showing 8 centuries of steady CO2 levels then a hyperbolic increase starting with the industrial revolution. www.newscientist.com/hottopics/climate/img/spread-2-8.jpg is a graph showing a 5 degree rise in earth’s average temperature since 1860
QUOTE: Originally posted by garyaiki Help me understand how people who aren’t highly paid by oil and coal companies still believe global warming is a hoax? The Pentagon is planning for global warming caused wars, insurance companies are raising rates in areas that will be flooded by global warming. NASA is planning to terraform Mars with greenhouse gasses. Google on “global warming” with some of these phrases “famine”, “hurricanes”, “gulf stream”, “mass extinction”, “sea level”, “glaciers”. It’s enough to ruin your day.
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