<P> Rapid changes in technology, changes in media (tapes, software, MP3), falling prices, and planned obsolescence have resulted in a fast - growing surplus of electronic waste around the globe . Technical solutions are available, but in most cases, a legal framework, a collection, logistics, and other services need to be implemented before a technical solution can be applied . </P> <P> Display units (CRT, LCD, LED monitors), processors (CPU, GPU, or APU chips), memory (DRAM or SRAM), and audio components have different useful lives . Processors are most frequently out - dated (by software no longer being optimized) and are more likely to become "e-waste" while display units are most often replaced while working without repair attempts, due to changes in wealthy nation appetites for new display technology . This problem could potentially be solved with modular smartphones or Phonebloks . These types of phones are more durable and have the technology to change certain parts of the phone making them more environmentally friendly . Being able to simply replace the part of the phone that is broken will reduce e-waste . An estimated 50 million tons of E-waste are produced each year . 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 . </P> <P> In 2006, the United Nations estimated the amount of worldwide electronic waste discarded each year to be 50 million metric tons . According to a report by UNEP titled, "Recycling--from E-Waste to Resources," the amount of e-waste being produced--including mobile phones and computers--could rise by as much as 500 percent over the next decade in some countries, such as India . The United States is the world leader in producing electronic waste, tossing away about 3 million tons each year . China already produces about 2.3 million tons (2010 estimate) domestically, second only to the United States . And, despite having banned e-waste imports, China remains a major e-waste dumping ground for developed countries . </P> <P> Society today revolves around technology and by the constant need for the newest and most high - tech products we are contributing to mass amount of e-waste . Since the invention of the iPhone, cell phones have become the top source of e-waste products because they are not made to last more than two years . Electrical waste contains hazardous but also valuable and scarce materials . Up to 60 elements can be found in complex electronics . As of 2013, Apple has sold over 796 million iDevices (iPod, iPhone, iPad). Cell phone companies make cell phones that are not made to last so that the consumer will purchase new phones . Companies give these products such short life spans because they know that the consumer will want a new product and will buy it if they make it . In the United States, an estimated 70% of heavy metals in landfills comes from discarded electronics . </P>

Select the best answer. which of the following are examples of materials that can be recycled