I believe that is stated in the article.
"The record run in oil prices is related more to speculation and a weakening dollar than supply and demand in the market." He added, "In terms of fundamentals, fear of supply reliability is overblown."
As for the speculators, in 2000 approximately $9 billion was invested in oil futures, while today that number has gone up to $250 billion. Now, if any publicly traded company had an additional $241 billion put into its stock in the same period, its stock would rise out of sight too—even if the company was not worth anywhere near that amount of market capitalization.