18. Agro ecosystem concepts A Presentation By Mr. Allah Dad Khan Visiting Professor the University of Agriculture Peshawar allahdad52@gmail.com

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Mr.Allah Dad Khan

A Presentation By Mr. Allah Dad Khan Visiting Professor the University of Agriculture Peshawar allahdad52@gmail.com

Environment

Concepts of Agro Ecosystem
A
Lecture
By
Mr Allah Dad Khan

18. Agro ecosystem concepts A Presentation By Mr. Allah Dad Khan Visiting Professor the University of Agriculture Peshawar allahdad52@gmail.com

The document discusses various sources of energy, dividing them into conventional and non-conventional sources. Conventional sources include fossil fuels like coal, petroleum and natural gas. These are used in thermal power plants to produce electricity. Hydro power plants use the kinetic energy of flowing water for electricity. Non-conventional sources include solar, wind, biomass, tidal, geothermal and nuclear energy. These provide alternatives to fossil fuels and many are renewable but also have challenges like cost, land use or waste disposal.

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Tidal energy is a renewable source of energy that harnesses the power of tides. It has several advantages, including being renewable as tides are driven by the gravitational pull of the moon and sun, being a green energy source that doesn't emit greenhouse gases, and having a predictable output. However, tidal energy also has disadvantages such as potentially impacting the environment, only being available when tides are surging for around 10 hours per day so requiring effective energy storage, and being an expensive new technology that is not yet cost-effective.

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The document discusses solar energy and its advantages. It notes that solar energy was the first energy source used, and many living things depend on it. Solar energy can be used to generate light and heat. It is one of the most widely used alternative energy sources globally. Solar energy can be extracted through solar thermal or photovoltaic cells. There are two kinds of solar energy: passive solar energy uses the sun's duration, position and intensity to heat areas, while active solar uses technology to capture, convert and store solar energy for later use.

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