What will be the "energy source" [fuel] of future?
406611
Either hydrogen or ethanol.  Research is being done at this moment to find safe, cheap, and efficient ways to bring these alternatives to the general public (of the US).  Nuclear power isn't very practical when it comes to cars, and it's proven to be pretty darned dangerous when it comes to powering homes and businesses.  Solar power is another option, but so far, it's not economical. (And for the people who say that we can't use solar power because the sun is running out, don't you realize that when the sun runs out, so do we?  Until then, the solar power is a very real - and potent - source of energy.)
16072
A synthetic gasoline product that we already have. Etyhenol (Spelling). I would also say that we could use some type of GeoThermal energy solution (like steam etc...)
313960
Fire\n\nInvention? Or discovery? *shrugs* But I'm thinking most of all we need and use just wouldn't be around without this heating component. Just a thought.
674682
it is a very important question and it return to future .we know  that in future all types of energy as oil will finish and nuclear energy will instead to other energy .and some country that are holder of this type of energy doesn't like other country can produce nuclear energy and will be dependent to them  .
1053174
If you mean greatest source as in overall production then solar shall be your answer hands down.  If you mean, greatest in the sense of coming from one place as a power plant, then one should answer fusion. And we should not discount used vegetable oil diesel vehicles.  The smell of cooking french fries on the highway is one generations to come shall savior..he..he.
117670
A method for making really cheap solarcells from sand and a way to transport the elctricity the generate without any loss. The amount of energy that falls on the Sahara during a year could cover the worlds entire energy needs 50 times over even using standard photocells that convert only a few percent of the light to electricity. With such an abundant and cheap energy source we could replace ALL other energysources as electricity can be converted to any other form of energy and fuel. We could even keep gasoline cars because gasoline could be manufactured from CO2 (from the air) and hydrogen (from water). There would be alot less pollution if I could invent these things.
262637
The best way is to build nuclear power plants. Duke Power of North Carolina has already built several. The modern world must have energy. There are several sources of energy of which coal and other fossil fuels is one. Nuclear is another.  There is also wind, solar, tides. Even gravitation--hydroelectric being an example.
473126
Hydrogen. You can create it from water using only electricity so it's the cheapest fuel ever. When you explode it (during combustion), it mixes with oxygen to create...you guessed it...water (no polution).\n\nSo:\n1.Free\n2.No polutants\n\nHmmm...
320753
Anything the energy can be converted to use for.\n\nUsually it is light and heat though.
1131325
Maybe this can help...all you have to do is a search in Yahoo or Google...\n\nhttp://www.think-energy.com/ThinkEnergy/11-14/activities/EnergyTrans.aspx\n\nTry searching for "energy" or "kinetic energy"
788942
Your question leads us to try and come up with what creates energy and that is not going to happen.\nI suppose you are asking what conversion processes exist and which is best for your needs or the needs of the general population.\nThe energy in fossil fuels is converted to heat and the most popular source is coal because it is least expensive.  That heat energy from coal is then converted to electricity at most power plants.\nThe energy in petroleum is converted to kinetic energy in your car's engine.  Since we buy millions of barrels per day, one can assume it is the most popular.\nThe energy coming from atomic fusion is the greatest energy used on the planet.  We get it from the sun.  We can capture that energy and convert it to electricity too.  Not only is it our planet's greatest source of heat, but also is the greatest source of light.  Given the number of people sunbathing at the pool, one can assume it is the most popular, too.  Atomic energy can also be pulled from uranium and turned into electricity or used to destroy entire towns.  One is popular, the other is not.\nPlease add some more info to your question.  It is too vague for me to answer well.  Just as minootoo points out, the pros and cons of ALL sources of energy is beyond the scope of this forum.
1114274
Tough question, however Solar and Wind are viable sources of energy where available.  BioMass and utilization of human waste are also viable sources of future energy.  There's some speculation about technology to harness the energy contained in Ocean Water (currents) though I am not an engineer and don't understand it at all.  Finally, eliminating wastefulness and extending the usefulness of exsiting fuel types will assure at least in the short term enough for all (this is particularly aimed at the USA as the largest consumer of existing fuels per capata in the World, the question is why)
376748
Wonderful question really.  "When will the Earth's fossil fuels run out?"  I have heard different estimates including in a few a decades, to a century.  Doesn't really matter now though does it. JESUS will return someday soon.  That is in the Bible.  That message was warned us from JESUS HIMSELF. Yet, in the here and now, if one wants a stable society without pandering to terrorists, supplying them with the money to build the bombs they want to use to destroy us, we need to end our dependency on foreign oil.  The only solution then is alternative renewable energy.  Solar Power, Batteries, Hydrogen, Fuel Cell technology.  Solutions such as Ethanol and Fuel additives are partial solutions which require often flexible engines that can use such fuels.  And it requires that we get oil tycoons, who have a vested monetary interest in current oil reserves to invest in and promote these technologies with incentives and the promise of future profits on their investments.  Yet, repent and prepare for the return of JESUS CHRIST, because he may return any day now.  Even today, be ready, everyday for that eventuality.  \n\n-LOVE YOUR NIEGHBOR AS YOURSELF
171959
It's timely that you ask this question - I am currently reading the book, "The End of Oil," which addresses this very issue.  I've only just begun the book, but it looks like we have another 30 years before the oil supply will start seeing a sharp decrease.  The fall in the oil supply will coincide with an increase in demand for energy, which spells TROUBLE.  Hopefully within 30 years time our brilliant engineers and scientists will have come up with a solution to the volatile and dangerous nature of hydrogen...
226685
Well, other forms of energy create so much more pollution that nuclear energy is the safest, most viable source of energy. I'll admit it's far from perfect, but considering the low output of energy collection devices such as solar and wind, nuclear energy has a huge output for a very low energy input.\n\nAnd nuclear power plants are among the most efficient power sources we have. Coal and nuclear plants are about 30-40% efficient. In contrast, the human body is only 20% efficient. Until we can develop a system of fusion that creates an acceptable amount of energy to warrant the energy required to start the reaction, fission is our best bet.
241725
The ultimate source of energy in all. living systems is the sun
128885
A renewable energy source is one that can be "renewed" , or can be produced again. Examples are wind, hydroelectric, and geothermal. Non-renewable energy comes from sources that cannot be created again, such as petrolium and coal.\nOur world is now looking for new renewable energy sources to take the place of nonrenewables when they run out.