Developing techniques to store solar energy
In reality there is enough energy already existing and being produced on the earth to supply the world with the power it needs. The issue of course is demand and cost. The sun at times hide behind clouds, and the wind does not blow on demand. And the factor of cost is of course ever present, and being able to affordably store energy is often one gate which stops the use of renewable energy.
However development for finding affordable ways to store energy is currently under way. And one method which is worth attention currently is underground storage. Research to store summer heat generated in soil and rocks for the usage of heating homes in the winter is conducted, and with such a solution the means of which the energy is created and the technology to harness it already exists.