raw materials, especially metals and their prices in historical times. He assumed that besides temporary shortfalls, in the long run prices for raw materials remain at similar levels or even decrease. E.g. aluminium was never as expensive as before 1886 and steel used for medieval armor carried a much higher price tag in current dollars than any modern parallel. A recent discussion of commodity index long-term trends supported his positions. His 1984 book The Resourceful Earth (co-edited by Herman Kahn), is a similar criticism of the conventional wisdom on population growth and resource consumption and a direct response to the Global 2000 report. For example, it predicted that "There is no compelling reason to believe that world oil prices will rise in the coming decades. In fact, prices may well fall below current levels". Indeed, oil prices trended downward for nearly the next 2 decades, before rising above 1984 levels in about 2003 or 2004. Oil prices have subsequently risen and fallen, and risen again. In 2008, the price of crude oil reached $100 per barrel, a level last attained in the 1860s (inflation adjusted). Later in 2008, the price again sharply fell, to a low of about $40, before rising again to a high around $125. Since mid-2011, prices were slowly trending downward until the middle of 2014, but falling dramatically until the end of 2015 to ca. $30. Since then prices were relatively stable (below $50). Simon was skeptical, in 1994, of claims that human activity caused global environmental damage, notably in relation to CFCs, ozone depletion and climate change. Simon also claimed that numerous environmental damage and health dangers from pollution were "definitely disproved". These included lead pollution & IQ, DDT, PCBs, malathion, Agent Orange, asbestos, and the chemical contamination at Love Canal. He dismissed such concerns as a mere "value judgement." Influence Simon was one of the founders of free-market environmentalism. An article entitled "The Doomslayer" profiling Julian Simon in Wired magazine inspired Danish Bjørn Lomborg to write the book The Skeptical Environmentalist. Simon was also the first to suggest that airlines should provide incentives for travelers to give up their seats on overbooked flights, rather than arbitrarily taking random passengers off the plane (a practice known as "bumping"). Although the airline industry initially rejected it, his plan was later implemented with resounding success, as recounted by Milton Friedman in the foreword to The Ultimate Resource