A science Questions...Need help plzzz?

Question

In Australia, most electricity is generated either by burning coal or by water flowing through a hydro-electric power plant.
Give reasons that support the method of electricity generation you believe has LEAST impact on the environment.

Answer 1

.....................Note..........................
Water is NOT a zero impact on the enviornment....It produces a silt below the dam that impacts the fish and wildlife and forestry, It is still better and cleaner to the enviornment and most especially humans.


.....................Water is Better...............
.............It Rejuvenates................
http://www.ecology.com/archived-links/hydroelectric-energy/
The energy in flowing water is ultimately derived from the sun, and is therefore constantly being renewed. Energy contained in sunlight evaporates water from the oceans and deposits it on land in the form of rain. Differences in land elevation result in rainfall runoff, and allow some of the original solar energy to be captured as hydro-electric power


...........Burning Fossil Fuel.................
....................COAL...........................
...........WORST IMPACT.....................
At least in the USA , so it has to be the same impact in Australia.........
http://www.ucsusa.org/clean_energy/fossil_fuels/
The extraction and burning of these fuels contributes to global warming, causes cancer and other chronic health problems, and degrades valuable land and water resources.
In fact, fossil fuel-fired electricity generation is the single greatest source of air pollution in the United States
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NOTE: you might want to use this link
...........The Power Scorecard ...............
http://www.powerscorecard.org/

The Environmental Issues
http://www.powerscorecard.org/issues.cfm

Answer 2

Two prominent solar PV sites include Citipower's Energy
Park called Project Aurora, and Energy Australia's Olympic Village, Homebush Bay, Sydney, New South Wales.
At the Olympic Village, each house in the suburb has been fitted with PV solar panelling on rooftops, which should generate 1600 kW hours a year (1.6 MWh), and for the village in total generate around 1 000MWh of electricity. For comparative purposes, the average suburban house would use around 8 to 10 MWh of electricity per year, hence, the Olympic Village complexes have supplemented their energy needs with space and water heating from other energy sources. Furthermore, electricity would need to be used carefully and optimally.

Answer 3

Electricity generated by solar power and wind, very friendly to the environment it has zero impact on the environment.