Refurbished. Refurbished phones are used phones that have been inspected, tested, and restored to full working condition at a factory or authorized service center. They may feature new housings or other new parts, or they may simply be used phones that have been tested and certified.ome âº Glossary âº. Refurbished phones are used phones that have been inspected, tested, and restored to full working condition at a factory or authorized service center.
Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.enewable energy flows involve natural phenomena such as sunlight, wind, tides, plant growth, and geothermal heat, as the International Energy Agency explains: Renewable energy is derived from natural processes that are replenished constantly.
Fossil fuels can be used at reduced levels as transition fuels to a renewable energy economy, or at higher levels if carbon sinks prove to be economical. Natural gas could serve as a transition fuel to hydrogen derived from solar energy, since the infrastructure for use would be similar for the two gaseous fuels. Natural gas can be complemented by renewable energy sources such as solar energy, biomass fuels (renewably produced and used), and wind energy. Wind energy and solar energy are economical under some circumstances (such as areas with high wind speed or high insolation and low precipitation).