He does have a wry sense of humour. Also regards the Saudis, oil minister Sheik Ahmed Zaki Yamani said regarding the future of his native kingdom, back in 2000: “Thirty years from now, there is no problem with oil. Oil will be left in the ground. The Stone Age came to an end not because we had lack of stones, and the oil age will come to an end not because we have lack of oil.” He pauses, and shakes his head. “I am a Saudi and I know we will have serious economic difficulties ahead of us.” Oil to solar: Saudis push to be renewable energy powerhouse Looks like perhaps they're making good on that.