Renewable energy sources
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Renawble energy sources
Renewable energy sourcesNowadays and predictions for the futureIn the last 10 years, the Earth warmed up by 1C
Why cant we notice the change?The answer, according to a new paper inGeophysical Research Letters, is that a lot of it is being stored in the deep ocean, more than a half-mile down. We normally think about global warming as what we experience on the Earth's surface, said co-author Kevin Trenberth, in an interview. If extra heat is temporarily stored elsewhere thanks to natural climate variations, we won't necessarily notice it.Consumption of energy till 2020
Solar, wind and waterWe dont know how to store electrical energy on a massive scale.
Michael Levi: Three Reasons Solar Will SucceedSolar can take advantage of improvements in materials, computing and nanotechnology in ways other technologies can't do nearly as effectively. Solar also has a host of initial niches it can grow in, from rooftop generation in places like California, to off-grid and micro-grid energy in often-sunny developing countries that lack good infrastructure. Solar is also a much better match for our energy demand than wind is. Solar power peaks when it's hotexactly when people want to crank up their air conditioners. Wind power peaks in the middle of the night when people are using a lot less power.How solar works
Powering devices with solar energy
Examples of gathering water energyA hydroelectric damcaptures energy from the movement of a river. Dam operators control the flow of water and the amount of electricity produced. Dams create reservoirs (large bodies of calm water) behind them, which can be used for recreation, wildlife sanctuaries, and sources of drinking water.Wave powercaptures energy from waves on the surface of the ocean using a special buoy or other floating device.Tidal powercaptures the energy of flowing waters with the help of turbines as tides rush in and out of coastal areas.
Dam and generator collect water energy
Wind energyStand-alone wind turbines are typically used for water pumping or communications. However, homeowners, farmers, and ranchers in windy areas can also use wind turbines as a way to cut their electric bills.Is a wind turbine loud?
Heat from the Earth.Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.Heating a home with geothermal energy.
Geothermal in detail
Energy is free although there is a cost of building collectors, does not cause pollution, can be used in remote areas, can power low energy consuming devices, it is infinite Disadvantages: Can be gathered only during sunny days, collectors are expensive, relies on climate, it is hard to store solar energy, batteries are heavy.
WaterPros Provides water for 30-30% of the worlds irrigated land Provides 19% of electricity Expands irrigation Provides drinking water Supplies hydroelectric energy (falling water used to run turbines) Easier for third world countries to generate power (if water source is available) It is cheaper Cons Destabilizes marine ecosystems Water wars (up river and down river; e.g., the water war between Georgia, Alabama, and Florida is ongoing) Dam building is very costly People have to relocate Some dams have to be torn down (Some older ones are not stable.) Restricted to areas with flowing water Pollution affects water power Flooding of available land that could be used for agriculture
WindAdvantages Continuous sources of energy Clean source of energy No emissions into the atmosphere Does not add to thermal burden of the earth Produces no health-damaging air pollution or acid rain Land can be sued to produce energy and grow crops simultaneously Economical Benefits local communities (jobs, revenue) Disadvantages For most locations, wind power density is low Wind velocity must be greater than 7 mph to be usable in most areas Problem exists in variation of power density and duration (not reliable) Need better ways to store energy Land consumption GeothermalAdvantages Significant Cost SavingReduce reliance on fossil fuelsNo pollutionDirect useJob creation/ economic benefitsDisadvantagesNot widespreadHigh costsCan run out of steamSuited to particular regionMay release harmful gasestransportationPotential Sources of Energy when Fossil Fuels Run Out
NUCLEAR FUSION Magnetic Plasma Confinement,Inertial FusionNUCLEAR FISSIONWaste &Nuclear Proliferation