Might be getting into a little bit of conspiracy here but it is my understanding that Tesla was advocating for a DC electrical grid while Edison was for AC. DC is stored easier and is cheaper to make....hmmmmm.
Edison was for DC and Tesla was for AC. Large scale distribution of DC in the quantities needed today would be virtually impossible. Also generation of DC is much more expensive.
Solar power is a viable substitute for power generation, but we will always need a primary source.
If we combine natural gas and coal, we have about 150 years of fossil fuels left. That's assuming the current rate of world industrialization. As that rate increases, the fossil fuels quantity will decrease. Alternative fuels resources must be explored, along with conservation of fossil fuels.
I have a suggestion. If the world would learn to live together, rather than fight continuous wars, the energy crisis would be easy to resolve. Unless the Lord comes and establishes His new kingdom on Earth, that isn't going to happen!