In 1931, not long before he died, he [Edison] told his friends Henry Ford and Harvey Firestone:
“I’d put my money on the sun and 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.”
This quote was popularized last year in the New York Times by Heather Rogers in an article titled: Current Thinking.
Heather Rogers, New York Times, June 3, 2007