What is this renewable energy source and why can we call it a biofuel?The renewable energy source is methane gas. Increasing the supply of renewable energy would allow us to replace carbon-intensive energy sources and significantly reduce US global warming emissions.

The majority of the power stations in South Africa are coal-powered and some others use hydropower, for example the Gariep Hydroelectric Plant on the Orange River near the Gariep Dam.There is limited supply of uranium in the world, which is why we classify it as a non-renewable source. Currently alternative energy sources are being explored, and used in a small scale in some places. The cow manure is swept up from the barn floors each day. Nuclear power is used to supplement coal fired power stations in South Africa.This is our first concept map for Energy and Change. [1 mark] Explain this in your own words.Renewable energy sources can be used again or recycled or replaced. Have a look at this website.Now that we have looked at non-renewable and renewable energy sources, let's summarize the disadvantages and advantages of each.While the learners are discussing in their groups, walk around and listen to some of the discussions. However, there are some major concerns about our reliance on non-renewable energy sources. Because it helps to maintain the room temperature better. Some learners may also confuse 'deforestation' with the sustainable use of wood as a fuel for cooking or heating.What do we mean when we say that something is renewable or non-renewable? What do you think? Why? These gases then trap more of the Sun's energy causing the Earth to warm up even more, and results in global warming.Wind farms are noisy and take up a lot of space; Need strong windsBurning releases greenhouse gases into the environmentCoal stores a lot of energy which is relatively easy to accessProduction of nuclear waste which needs to be storedDams must be built and this damages/changes the landscape and affects ecosystems; Expensive to set up and maintainSustainable.

There is now an Play a simulation to learn more about the greenhouse effectFind out what else, besides burning fossil fuels, is contributing to an increase in greenhouse gases and write it below.Other sources that contribute to an increase in greenhouse gases are:Energy can be produced by nuclear reactions. Renewable sources of energy are the ones which can be generated continuously in nature and are inexhaustible. The heat inside the Earth produces steam and hot water that can be used to power generators and produce electricity, or for other applications such as home heating and power generation for industry. The energy of the wind has been used for centuries to sail ships and drive windmills that grind grain. Pick one renewable energy recourse, and briefly present it as if you are addressing a class of 12 year old children. It is similar to the wind energy. Air conditioners are just energy hogs and fans can do a much better job than your typical AC, here’s how:   Differentiator Air conditioners Fans What they do Air conditioners […]Did you know? Let's do a quick revision to see how much you remember from Grade 6.Uranium is the source of energy for nuclear power stations.Draw a table in the following space to classify the energy sources in the images as either renewable or non-renewable. Using current technologies, most ocean energy is not cost-effective compared to other renewable energy sources, but the ocean remains an important potential energy source for the future. Uranium is an element. UAE (United Arab Emirate) 2050 Energy strategy calls for reduction on carbon dioxide emissions by 70%, increasing clean energy use by 50% (RE 44% and Nuclear 6%), and improve energy efficiency by 40% by the middle of the century.

Liquids biofuels. However, there are some major concerns about our reliance on non-renewable energy sources. As the manure decomposes, it releases methane gas. A disadvantage is that they produce excess greenhouse gases when they are burnt and that the supply is limited.Discuss, in your groups, the advantages and disadvantages of using renewable energy sources.A major advantage of renewable energy sources is that the supply will not run out and so their use is sustainable.

Energy from ocean waves and tides can be harnessed to generate electricity, and ocean thermal energy—from the heat stored in seawater—can also be converted to electricity. We only have one nuclear power station, Koeberg near Cape Town. Geothermal energy can be drawn from deep underground reservoirs by drilling, or from other geothermal reservoirs closer to the surface. The sun is our most powerful source of energy. Most of the South African power stations are coal-fired power stations. This chapter also introduces the idea of fossil fuels, which links to what learners will do next term in Earth and Beyond.An interesting article on how to encourage learners to pursue STEM careers: Researching, reading, evaluating, writing, discussingActivity: What are the advantages and disadvantages?The concept of renewable versus non-renewable energy sources was introduced in Grade 6. We extend the idea of renewable and non-renewable energy sources by detailing the different types and classifying them. [1 mark]It is something which has energy stored in it which can be used.Which of the following are sources of energy? Once separated from other elements, hydrogen can be used to power vehicles, replace natural gas for heating and cooking, and generate electricity.


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