Energy Renewable

GLoBAL Warming is the increase in near-surface air temperatures from the emission of greenhouse gases and particulate black carbon. Greenhouse gases result mostly from fossil fuel burning to produce energy. For industrial and household energy needs, humans compromise on greenhouse gas produc tion, and endanger the future. However, the advent of renewable energy would reduce the production of greenhouse gases. Therefore, renewable energy is considered clean energy.

According to the International Energy Agency (IEA), renewable energy "is derived from natural processes that are replenished constantly. In its various forms, it derives directly from the sun, or from heat generated deep within the earth. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, biofuels, and hydrogen derived from renewable resources." The use of renewable energy is an old concept. More than a century ago, wood supplied up to 90 percent of the world's energy needs. The use of wood as an energy source has fallen in the last century because of low prices for fossil fuels and their conveyance advantage. With climate change concerns, the rising cost of fossil fuels, and increasing government support, renewable energy production is increasing. The disposal problem of biomass, such as manufacturing wastes, rice hulls, agricultural wastes, and black liquor from paper production is encouraging biomass burning to produce electricity and biofuels. Presently, about 13 percent of the world's primary energy comes from renewable sources such as the burning of traditional biomass. Hydropower provides 2-3 percent, and modern technologies such as geothermal, wind, solar, and marine energy meet less than one percent of world demand.

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