Because of the profound influence snow has on natural ecosystems (Jones et al., 2001) and the human environment, snow measurement science has a long and rich history extending from Chinese snow cages in the first millennium (Biswas, 1970) to ultrasonic snow sensors employed on automatic weather stations (Gubler, 1981; Goodison etal., 1988). A recent review of snow-cover observations and data sources was provided by Groisman and Davies (2001). Properties of a snow cover that have been routinely monitored are: snow depth, snow water equivalent, and snowfall (amount and water equivalent). Strictly speaking snowfall is not a property of a snow cover, but it is included here because of its essential role in the initiation and accumulation of a snowpack. In addition, numerous paleo and proxy sources of information related to snow cover are available. A brief overview of data sources and measurement issues are provided below.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.