sources of energy in one hundred years it could change alot of things in matter of sources of energy. many decades ago the only way to generate electricity power it was through derivatives from petroleum, but actually there are many ways to generate power from natural resources such as water, volcanoes, wind etc. however in the future i think that there will be a lack of electric power because petroleum is an exhaustible resource and when all the petroleum reserves will have run out we will only depend of the power generated from natural resources which won´t be sufficient above all because of the enviromental degradation and the population growth. we will have already died within one hundred years, but we have to think about the future generation, we must reduce the consumption of energy and preserving natural resources to avoid an energy crisis in the future.