I’d put my money on solar energy. What a source of power!
I hope we don’t have to wait until oil and coal run out before we tackle that.
I wish I had more years left.
Thomas Alva Edison
February 11, 1847 - October 18, 1931 (aged 84)
That second part, the bolded comment got me thinking that Edison, recognizing the potential of the sun to meet our energy needs and knowing that fossil fuels were a finite resource, towards the end of his life wanted very much to be around to see this remarkable resource harnessed and developed into something sustainable.