Electronic waste — including discarded televisions,
computers and mobile phones — is one of the fastest-growing waste categories worldwide. Researchers report that recovering gold, copper
and other metals from e-waste is cheaper than obtaining these metals from mines. About 50 million tons of e-waste will be discarded
around the world in 2018. This type of waste contains a surprising amount
of metal. For example, a typical cathode-ray tube TV
contains almost a pound of copper and more than half a pound of aluminum.