Personal computers are eating their way into the planet's resource base, and their useful lives must be extended to lighten the burden they put on Earth's air, land and water, according to a new report from the United Nations University (UNU) on the environmental consequences of the information technology revolution.
Computer sales are growing about 10 percent per year and more than 130 million computers are being sold each year around the world, the authors found. By the end of 2002, one billion personal computers had been sold worldwide.
"Today it is hard to imagine life without one of these indispensable 21st century tools," said Eric Williams, the UNU scientist who leads the Information Society and Environment Issues project and Ruediger Kuehr, who co-edited the book. "But it is exactly because they have become so ubiquitous that we must be aware of the negative impacts of the PC boom."
While computers become smaller and more powerful, their environmental impacts are increasing, say Williams and Kuehr.
Government incentives worldwide are needed to extend the life of personal computers and slow the growth of high-tech trash.
The average 53 pound (24 kg) desktop computer with monitor requires at least 10 times its weight in fossil fuels and chemicals to manufacture, the authors say, and that makes it much more materials intensive than an automobile or refrigerator, which only require one to two times their weight in fossil fuels to make.
The researchers found that manufacturing one desktop computer and 17 inch CRT monitor uses at least 530 pounds (240 kg) of fossil fuels, 50 pounds (22 kg) of chemicals and 3,330 pounds (1,500 kg) of water a total of 1.8 metric tons of materials – roughly the weight of a sports utility vehicle.
The materials and energy intensive production process, greater adoption of PCs worldwide, plus the rapid rate at which they are discarded for newer machines, add up to "growing mountains of garbage and increasingly serious contributions to resource depletion, environmental pollution and climate change," they warned.
Hundreds or even thousands of chemicals, many of them toxic, are used to produce a computer and a set of specific health concerns has arisen regarding chemical exposure in the production process. There are possible long term health effects on workers, families and neighboring communities due to chemical exposure and emissions from production stages such as microchip fabrication, the authors warn.
A group of chemicals called brominated flame retardants used in circuit boards and plastic computer cases is of particular concern. Recent studies in the United States, Canada and Sweden show that concentrations of these compounds in humans have been increasing rapidly. In sufficient dosages, they can cause neuro-developmental disorders and possibly cancer.
Monitors, and to a lesser extent computers, contain quantities of heavy metals such as lead, mercury, cadmium and chromium, which pose potential health risks to production workers and environmental risks to water supplies near landfills where they are eventually dumped.
Because so much of the energy used over the life cycle of a computer is in manufacturing high-tech components, which are usually destroyed in recycling processes to recover raw materials, the energy savings potential of reselling or upgrading is some five to 20 times greater than recycling, says Williams.
Much electricity is wasted as computers also tend to be left on when not in use, even overnight. Many users falsely believe that turning off machines can harm the components. In practice, turning computers on and off shortens their lifespan only after around 20 years of use, not relevant for most equipment.
Spurred by the EnergyStar certification program administered by the U.S. Environmental Protection Agency, most computers are now are equipped with standby modes which automatically put the computer into low power mode when not being used. But, the authors say, the Energy Star label becomes meaningless for a great many computers, as they never actually go into standby mode in real life. Computers connected to a network will often be "kept awake" by traffic from servers and other machines.
The UNU report identifies the options available to national, regional and local governments that wish to lessen the environmental and health impacts of computers.
the environmental regulation of manufacturing processes – setting standards for emissions from semiconductor factories
regulating the environmental characteristics of computer products – banning the use of lead and other heavy metals
mandatory product take-back
recycling systems and voluntary programs like eco-labeling
funding research and analysis, as well as education and public awareness campaigns, on the environmental impacts of computers.
The study analyzes the European Union's new Waste Electrical and Electronic Equipment (WEEE), legislation which will mandate recycling of computers throughout the EU starting 2005. Contributors Klaus Hieronymi and Axel Schneider say the actual environmental benefit and economic performance of the take-back system will depend crucially on how it is implemented.
The study notes that none of the existing legislation in Europe or elsewhere really tries to extend the lifetimes of computers and components, despite the huge environmental and economic potential.
According to Kuehr, of the UNU Zero Emissions Forum, some government policies such as taxation rules even have the opposite effect of shortening lifespan.
"The tax system should assess refurbished PCs at least equal to new ones," Kuehr says. An incentive system for those trying to prolong the lifespan of their IT products would mean depreciation according to the age of the machines.
"Such a system would easily create additional impetus for manufacturers to reconsider design approaches and make products more easily upgradeable," he says.
Electronics firms are trying to reduce the environmental burdens of their products. In the book, environmental managers at Fujitsu Siemens and IBM detail the environmental policy, management systems, eco-labeling, and take-back, resale, and recycling measures implemented at their corporations.
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