How does the energy degradation of the different world energy sources impact the moral, economic, and environmental future of the globe?

To start with we should know what is the energy degradation. We can define it as a unusable, thermal energy created during the transformation of energy to work. Energy is not destroyed during the conversion it only becomes unavailable for producing work. To find how different energy sources impact the moral, economic,and anvironmental future of the globe we have to discuss them separatly.
Fossil fuels are most popular energy source these days. The reason why its so popular is that its relatevly cheap and easy to transport, we can relase a lot energy from small mass of fuel, thats because engines using fossil fuels were upgraded for many years and now technology used make them very powerful and thrifty. Best example are cars engines. Few years ago 1,4cm³ engine was powerless but economical, now 1,4cm³ have about 150 horsepower which make them economical and powerfull. Producents also are trying to cut down CO2 emission, which make cars more expenisive. European Union made all countries to cut down emission CO2, by puting limits, and if some country exceed them, they must pay penalty. The reason why the pressure is puted on is that EU is looking for alternative energy source, some say that the earth will be run out of fuels in 2050, and thats why we have to think about now, because if we do not find the solution it may be to late. I believe that we still can relase more energy from fossil fuels, but we have to think about that is it worth to concentrate on fossil fules, because may be we should use this time to find some other energy sources. We can not be subordinate on fossil fuels, because there is possibility that our children world will collapse.
Nuclear is an alternative to a fossil fuels, its much more powerfull and much more expensive. But as we know we have to find other energy source then fossil fuels.Nuclear power have many adventages, but also disadventages. I think that the biggest adventage of nuclear power is that its very powerfull and does not emit harmful toxins into the atmosphere which now is very important. Disadventages are risky for us much more than burning fossil fuels, possibility of nuclear meltdown from uncontrolled reaction leads to nuclear fallout with potentially harmful effects on civilians, also waste products can be used to manufacture weapons, which can affects a nuclear war and extermination of the earth live.
Non-fossil fuels seemed to be the way that we should follow, because its relatevly cheep, but technology that we have now made this energy source not enough powerfull to replace fossil fuels. Thats why we should expand and look for technology that will let us use this energy source more commonly. Adventages that non-fossil fuels have are very important for us because they do not emit any toxins to the atmosphere, they are renewable and we will never run out of them, because there is really small possibility that sun will not rise or the wind woluld stop. For now we should use non-fossil fuels as a supplement to the other energy sources, but we should work up to make this type of fuel our main source of energy.