Read about the laws of thermodynamics.
Law no. 2 is the tricky one. It says that the entropy of a given system can only increase. Thermal energy can not be converted to other forms of energy without loss.
Actually law no 2. is the one that allows life and creation of life in an open system. It is also explains that perpetuum mobiles are not possible.
In other words, it always takes more energy to create order than to destroy order. Our open system planet earth accumulated lots of energy from the sun over millions of years. Planet earth invested part of that sun energy to convert energy into oil, coal. If you burn coal or oil in an engine to produce f.e. electricity, that process can not be reversed, more precise it can not be reversed without investing additional energy.
And that should explain why we are always loosing thermal energy and will eventually face a shortage of accumulated energy in form of oil or coal.
Energy crisis on the long run can only be avoided by harvesting energy directly from the sun (renewable energy, photovoltaic, wind...)
http://hubpages.com/forum/topic/72975
Law no. 2 is the tricky one. It says that the entropy of a given system can only increase. Thermal energy can not be converted to other forms of energy without loss.
Actually law no 2. is the one that allows life and creation of life in an open system. It is also explains that perpetuum mobiles are not possible.
In other words, it always takes more energy to create order than to destroy order. Our open system planet earth accumulated lots of energy from the sun over millions of years. Planet earth invested part of that sun energy to convert energy into oil, coal. If you burn coal or oil in an engine to produce f.e. electricity, that process can not be reversed, more precise it can not be reversed without investing additional energy.
And that should explain why we are always loosing thermal energy and will eventually face a shortage of accumulated energy in form of oil or coal.
Energy crisis on the long run can only be avoided by harvesting energy directly from the sun (renewable energy, photovoltaic, wind...)
http://hubpages.com/forum/topic/72975