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  2. Plastic recycling - Wikipedia

    en.wikipedia.org/wiki/Plastic_recycling

    Globally, this is by far the most common form of recycling and in many countries it is the only type practised. It is the simplest and most economical technique. It has a lower carbon footprint than other processes. [85] However, several factors can reduce output quality, which limits its applicability. [85]

  3. Value-added tax - Wikipedia

    en.wikipedia.org/wiki/Value-added_tax

    [98] [99] [100] However, two states enacted a form of VAT in lieu of a business income tax. Michigan used a form of VAT known as the "Single Business Tax" (SBT) from 1975 until voter-initiated legislation repealed it, replaced by the Michigan Business Tax in 2008. [101] Hawaii has a 4% General Excise Tax (GET) that is charged on gross business ...

  4. Solar cell - Wikipedia

    en.wikipedia.org/wiki/Solar_cell

    A solar cell or photovoltaic cell (PV cell) is an electronic device that converts the energy of light directly into electricity by means of the photovoltaic effect. [1] It is a form of photoelectric cell, a device whose electrical characteristics (such as current, voltage, or resistance) vary when it is exposed to light.