And see this.
The sun produces light and heat, but also various forms of magnetic and other energies. It also produces exotic particles like neutrinos.
At first, we will be only able to collect and use very limited portions of the EM spectrum. Eventually, we will be able to use more and more parts of the spectrum to power our machines directly or through conversion to other types of energy.
One day, virtually every surface will be turned into an energy-production medium. Instead of having discreet energy-producing machines, roofs, exterior walls, sidewalks, roads and many other surfaces will be coated with "smart materials" which convert light, heat, pressure and other inputs into useful energy, which are then collected, stored and distributed as needed.
Hundreds or thousands of years in the future, mankind might even learn how to collect the virtual particles which are constantly popping into and out of existence.
Indeed, one of the world's leading trend forecasters, Gerald Calente, believes that zero point energy or energy generated by neutrinos or other high-tech methods might be stumbled upon fairly soon - and that such a discovery would lift us out of the economic depression. He also says that producing our own energy for our homes and cars (called "micro generation") will become a huge trend in the next couple of decades. See this.
Harvesting The Ocean of Energy
Perhaps the biggest evolution needed in people's thinking - in any area of life - is how we think about energy.
The current paradigm is that energy is produced expensively by governments or large corporations through gigantic projects using enormous amounts of money, materials and manpower. Because energy can only be produced by the big boys, we the people must bow our heads to the powers-that-be. We must pay a lot of our hard-earned money to buy electricity from them, and we can't question the methods or results of their energy production.
Our life will become much better when we begin to understand that energy is all around us - as an ocean of electromagnetic forces and as a byproduct of other processes in the form of heat, pressure, etc. - and all we need do is learn how to harvest it.
Note 1: A better future of plentiful energy will only happen if we loudly demand it from our politicians and other "leaders". If we just sit back and wait for it, the powers-that-be will buy up and suppress all promising technology, to ensure that the models of scarcity and centralized energy production - and thus high prices and concentration of power - prevail.
Note 2: Buckminister Fuller worked for 50 years to show that things can be designed and built efficiently and with little input of energy, materials, money and manpower. Energy engineers must obviously ensure high EROI (energy return on investment, to ensure more energy output than input). However, high energy requirements during the R&D and production phase may be more than compensated for by a long lifetime of energy generation once installed. In other words, it is obviously necessary to look at the entire lifecycle of the technology.
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