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Energy density differs from energy conversion efficiency (net output per input) or embodied energy (the energy output costs to provide, as harvesting, refining, distributing, and dealing with pollution all use energy). Large scale, intensive energy use impacts and is impacted by climate, waste storage, and environmental consequences.
Wood made up the majority of this until near the end of the 1800s, meaning the average American burned eight tons of wood each year. [12] The Industrial Revolution in the United States saw an increased use of coal. By the late 1800s, it surpassed wood as the major source of energy, as it was cheaper for those living in cities.
Costs and payback periods for residential SWH systems with savings of 200 kWh/month (using 2010 data), ex maintenance costs, subsidies and installation costs Country Currency System cost Subsidy(%) Effective cost Electricity cost/kWh Electricity savings/month Payback period(y) Brazil: BRL: 2500 [54] 0: 2500: 0.25: 50: 4.2 South Africa: ZAR ...
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