How to solve a carbon dating problem martin and tichina arnold dating
In A 2011 report, "Ghana E-Waste Country Assessment", found that of 215,000 tons of electronics imported to Ghana, 30% were brand new and 70% were used.Of the used product, the study concluded that 15% was not reused and was scrapped or discarded.Others are re-usables (working and repairable electronics) and secondary scrap (copper, steel, plastic, etc.) to be "commodities", and reserve the term "waste" for residue or material which is dumped by the buyer rather than recycled, including residue from reuse and recycling operations, because loads of surplus electronics are frequently commingled (good, recyclable, and non-recyclable), several public policy advocates apply the term "e-waste" broadly to all surplus electronics.Cathode ray tubes (CRTs) are considered one of the hardest types to recycle.Informal processing of e-waste in developing countries can lead to adverse human health effects and environmental pollution.Electronic scrap components, such as CPUs, contain potentially harmful components such as lead, cadmium, beryllium, or brominated flame retardants.Electrical waste contains hazardous but also valuable and scarce materials.Up to 60 elements can be found in complex electronics.
Display units (CRT, LCD, LED monitors), processors (CPU, GPU, or APU chips), memory (DRAM or SRAM), and audio components have different useful lives.
The USA discards 30 million computers each year and 100 million phones are disposed of in Europe each year.
The Environmental Protection Agency estimates that only 15–20% of e-waste is recycled, the rest of these electronics go directly into landfills and incinerators.
Electronic waste or e-waste describes discarded electrical or electronic devices.
Used electronics which are destined for reuse, resale, salvage, recycling, or disposal are also considered e-waste.
CRTs have relatively high concentration of lead and phosphors (not to be confused with phosphorus), both of which are necessary for the display.