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greenGreen computingGreen computing is the study and practice of using computing resources efficiently. Typically, technological systems or computing products that incorporate green computing principles take into account the so-called triple bottom line of economic viability, social responsibility, and environmental impact. This differs somewhat from traditional or standard business practices that focus mainly on the economic viability of a computing solution. These focuses are similar to those of green chemistry; reduction of the use of hazardous materials such as lead at the manufacturing stage, maximized energy efficiency during the product's term of use, and recyclability or biodegradability of both a defunct product and of any factory waste. A typical green computing solution attempts to address some or all of these factors by implementing environmentally friendly products in an efficient system. For example, an IT manager might purchase Electronic Products Environmental Assessment Tool (EPEAT)-approved hardware combined with a thin client solution. As compared to a traditional desktop PC configuration, such a configuration would probably reduce IT maintenance-related activities, extend the useful life of the hardware, and allow for responsible recycling of the equipment past its useful life. Green computing An open industry standard called Advanced Configuration and Power Interface (ACPI) provides a standard programming interface that allows an operating system to directly control the power saving aspects of the hardware. This allows the system to automatically turn off components such as monitors and hard drives after set periods of inactivity. In addition, a system may hibernate, in which it turns off nearly all components, including the CPU and the system RAM, greatly reducing the system's electricity usage. To resume from this state, some components, such as the keyboard, network interface card, and USB ports may remain powered, to receive input from the user. ACPI itself is a successor to an earlier Intel-Microsoft standard called Advanced Power Management, which allows a computer's BIOS to control power management functions. In the absence of ACPI or APM support, some external components, such as computer displays, printers, scanners, speakers, and hard drives may be turned off manually when not in use. In this state, though the external periphals may be off, the main system continues to consume electricity. To minimize the impact, the system could run file sharing software or volunteer computing software, donating its resources to a long-term project. Some software programs allow the user to manually adjust the voltages supplied to the CPU, essentially reducing the amount of electricity used by the CPU while it's on and powered. Since many CPUs have "safety-nets" on either side of the spectrum (+/- the voltage parameters of a given CPU), one is able to reduce the amount of volts the processor uses, hence reducing both the amount of heat produced and the amount of electricity consumed. Some CPUs from Intel Corporation and AMD, particularly those intended for use in laptops, have technology to automatically adjust the processor voltages depending on the workload. This technology is called "SpeedStep" with intel processors, "PowerNow!"/"Cool'n'Quiet" with AMD chips, LongHaul with VIA CPUs, and LongRun with Transmeta processors. In 2007, Intel Corporation released a utility called PowerTOP, which measures and reports on a PC's power consumption. This utility is available only for PCs running a Linux operating system.ewasteEwaste is Electronic waste. E-waste as Waste Electrical and Electronic Equipment is a waste type consisting of any broken or unwanted electrical or electronic appliance. Recyclable electronic waste is sometimes further categorized as a "commodity" while e-waste which can not be reused is distinguished as "waste". Both types of e-waste have raised concern considering that many components of such equipment are considered toxic and are not biodegradable. Responding to these concerns, many European countries banned e-waste from landfills in the 1990s. The European Union would further advance e-waste policy in Europe by implementing the Waste Electrical and Electronic Equipment Directive in 2002 which holds manufacturers responsible for e-waste disposal at end-of-life. Similar legislation has been enacted in Asia, with e-waste legislation in the United States limited to the state level due to stalled efforts in the United States Congress regarding multiple e-waste legislation bills. Due to the difficulty and cost of recycling used electronics as well as lackluster enforcement of legislation regarding e-waste exports, a staggering amount of used electronics has made its way into countries such as China, India, and Kenya where lower environmental standards and working conditions make processing e-waste more profitable. ewaste If treated properly, electronic waste is a valuable source for secondary raw materials. However, if not treated properly, it is a major source of toxins and carcinogens. Rapid technology change, low initial cost and even planned obsolescence have resulted in a fast growing problem around the globe. Technical solutions are available but in most cases a legal framework, a collection system, logistics and other services need to be implemented before a technical solution can be applied. Electronic waste represents 2 percent of America's trash in landfills, but it equals 70 percent of overall toxic waste. Due to lower environmental standards and working conditions in China, India, Kenya, and elsewhere, electronic waste is being sent to these countries for processing – in most cases illegally. Guiyu in Shantou region of China, and Delhi and Bangalore in India, all have electronic waste processing areas.[2] Uncontrolled burning, disassembly, and disposal are causing environmental and health problems, including occupational safety and health effects among those directly involved, due to the methods of processing the waste. Trade in electronic waste is controlled by the Basel Convention. Electronic waste is of concern largely due to the toxicity and carcinogenicity of some of the substances if processed improperly. Toxic substances in electronic waste may include lead, mercury, cadmium. Carcinogenic substances in electronic waste may include polychlorinated biphenyls (PCBs). A typical computer monitor may contain more than 6% lead by weight, much of which is in the lead glass of the CRT. Capacitors, transformers, PVC insulated wires, PVC coated components that were manufactured before 1977 often contain dangerous amounts of polychlorinated biphenyls. Up to thirty-eight separate chemical elements are incorporated into electronic waste items. The unsustainability of discarding electronics and computer technology is another reason for the need to recycle – or perhaps more practically, reuse – electronic waste. E-waste is often exported to developing countriesElectronic waste processing systems have matured in recent years following increased regulatory, public, and commercial scrutiny, and a commensurate increase in entrepreneurial interest. Part of this evolution has involved greater diversion of electronic waste from energy intensive, down-cycling processes where equipment is reverted to a raw material form. This diversion is achieved through reuse and refurbishing. The environmental and social benefits of reuse are several: diminished demand for new products and their commensurate requirement for virgin raw materials and larger quantities of pure water and electricity for associated manufacturing, less packaging per unit, availability of technology to wider swaths of society due to greater affordability of products, and diminished use of landfills. Challenges remain, when materials cannot or will not be reused, conventional recycling or disposal via landfill often follow. Standards for both approaches vary widely by jurisdiction, whether in developed or developing countries. The complexity of the various items to be disposed of, cost of environmentally sound recycling systems, and the need for concerned and concerted action to collect and systematically process equipment are the resources most lacked -- though this is changing. Many of the plastics used in electronic equipment contain flame retardants. These are generally halogens added to the plastic resin, making the plastics difficult to recycle. Wiki ewaste |
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| Desktop computers come in a variety of case styles ranging from large vertical towers to small form factor models that can be tucked behind an LCD monitor. Where a voluntary liquidation proceeds by way of creditor's voluntary liquidation, a liquidation committee may be appointed refurbished notebooks Katie Price sell my computer sell my computer desktop computers Desktops are currently the most affordable computers and ubiquitous in businesses, schools, and households; they are used for performing office tasks, organizing digital photos, video editing, and Internet access. Nearly all desktop computers are modular, with components that can easily be replaced or upgraded. The ability to store and execute lists of instructions called programs makes computers extremely versatile and distinguishes them from calculators computer recycling Keira Knightley sell my laptop sell my laptop computer laptops Does recycling Save energy? There is controversy on just how much energy is saved through recycling. The EIA states on its website that "a paper mill uses 40 percent less energy to make paper from recycled paper than it does to make paper from fresh lumber." Critics often argue that in the overall processes, it can take more energy to produce recycled products than it does to dispose of them in traditional landfill methods. This argument is followed from the curbside collection of recyclables, which critics note is often done by a second waste truck in addition to the truck that picks up the regular trash. The EIA states on its website that a paper mill uses 40 percent less energy to make paper from recycled paper than it does to make paper from fresh lumber discount computer Kim Cattrall sell your lap top sell your lap top buy computer | computer notebooks computer prices computer prices computer recycle computer recycle computer recycled computer recycled computer recyclers computer recyclers computer recycling computer recycling computer removal computer removal computer sale computer sale computer sales computer sales computer scrap computer scrap computer store computer store computer surplus computer surplus computer surplus computer surplus computers for sale computers for sale desktop computers desktop computers discount computer discount computer discount computers discount computers donate computer donate computer donate computers donate computers free computer recycling free computer recycling laptop computer laptop computer laptop computers laptop computers notebook computers notebook computers old computer old computer old computers old computers recycle computers recycle computers recycling computers recycling computers refurbished notebooks refurbished notebooks refurbished pc refurbished pc surplus computers surplus computers used computer used computer my laptop sell used pc |