There are many, but most popular for home use are solar and wind. Solar can be in the form of home heat, Photovoltaic, space heating or even steam. Wind comes in many different forms, Vawt(vertical axis wind turbine), Hawt(horizontal axis wind turbine), large scale as in the ones that are 150 feet tall and small like you would set up yourself.
Water, grass, wood, gas, waste, wind, nuclear, food, the 1st motor fuel made was bio fuel, oil was just cheap and the oil company can lie to the people about it , but earth make oil all the time. As the world rotate it make oil. The day the earth can,t make oil we all die for the earth will die.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.