Group 11 element Parkes process. These metals, especially silver, have unusual properties that make them essential for industrial applications outside of their monetary or decorative value. They are all excellent conductors of electricity. The most conductive of all metals are silver, copper and gold in that order. Silver is also the most thermally conductive element, and the most light reflecting element. Silver also has the unusual property that the tarnish that forms on silver is still highly electrically conductive. Copper is used extensively in electrical wiring and circuitry. Gold contacts are sometimes found in precision equipment for their ability to remain corrosion-free. Silver
Green electricity in the United Kingdom coherent carbon accounting. This will mean that for the reporting year 2008-9, best practice is expected to be for businesses to use a grid average rate – average rate of carbon emissions associated with electricity transmitted on the national grid – unless their supplier can prove the carbon benefits are additional." This does not affect green electricity generated on site (e.g. from photovoltaics or a micro-wind turbine), which can continue to be reported as producing zero emissions. In 1999 the Future Energy national certification scheme for green electricity was launched, however it was closed in 2002, apparently because too few