Most of that material is water, for things like cooling and whatnot. From the Slashdot link...
Quote:
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According to the study, the manufacturing of one desktop computer and 17-inch CRT (cathode ray tube) monitor requires at least 240 kilograms of fossil fuels, 22 kilograms of chemicals and 1,500 kilograms of water. In terms of weight, the total amount of materials used is about equal to that of a mid-size car.
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I wonder where the UN got their sources from? How much of that water is recyclable? Are those fossil fuels from power generation? If so, what form of energy generation did they use?
Unless the justifications for each part are provided, this study is useless.