Renewable Energy free essay sample

Energy Today, many countries mainly developed nations are dependent on non-renewable energy sources such as fossil fuels (oil and coal) and nuclear power. People call these sources, non-renewable energy because they cannot be regenerated or replaced once it is used. These sources are sources that exist in a limited amount on earth. University of California College (2009) state that over 85% of the energy used in the world is from non-renewable supplies. Most of countries in this world need these sources of energy for industrialization. Many countries use non-renewable energy sources because they are very concentrated forms of energy. Nevertheless, non-renewable energy is bad for environment because it causes of pollution and can lead to global warming. We need renewable energy sources to help us continuing our lives and replace the non-renewable energy sources. Renewable energy is energy, which comes from natural resources, such as sunlight, rain, wind, and geothermal heat, which are renewable. Renewable energy is an environmental concern because it affects environment. It affect the environment by give some benefits to it. The benefits are it keeps the environment clean because the renewable sources produce little or no pollutions. A country with little pollutions will be more attractive to visit and if many people come to visit the country it will be good for its economy sector too. Renewable energy also prevents extinction of natural resources for our future generations. This renewable energy is affect human because it can create job opportunity for people and make people save more money because some of renewable energy such as sunlight and rain can used without people pay for it. It also affect human because people in a country with high use of renewable energy will be healthier because the country will only produce few pollutions. Less pollution will also lead a country to gain more prosperity for its nation. Some example of using renewable energy are when we drying our clothes on the clothesline in the wind or sun. Other example is using wind turbines to make electricity. Use of renewable energy has some advantages and disadvantages. The advantages by use renewable energy are we can use it without depleting it. It has no contribution to global warming and produces only little or no pollutions. Renewable energy causes people saving on health because if there are less pollution that means less sick people too. The disadvantages of using this energy are this renewable energy is difficult to produce large amount of electricity. For example is solar energy, which uses sun to produce the energy. If the location of collectors is large, more materials will need. It also limited to daytime and cloudy days. Nevertheless renewable energy still can produce pollutions. For example is wind turbines, they threaten the wild bird populations and very noisy to operate, which lead to noise pollution. What happens in Rotherham (a town in South Yorkshire, England) can be an example for the disadvantage possibility may happen by using wind turbines. The plans to use wind turbines to generate power for 10,000 homes in this town received many contra. The residents there oppose the plan because they are afraid that the turbine winds will damage the skyline. The use of renewable energy is also limited because they are not always available. For examples are cloudy days detain solar energy to operate, calm days have no wind blows to drive wind turbines and droughts cause limited availability of water to produce hydroelectricity. These are some energy that can consider as a renewable energy sources: 1. Solar Energy This is an energy that uses sun as a source. This energy can be used for lighting, heating and generating electricity. Solar energy can come directly and indirectly from the sun. For example: heat from the sun causes the wind to blow, it help trees to growth, and plays an important role in the cycle of evaporation. 2. Wind energy This energy is used for sail ships and drive wind turbines to generate electricity. 3. Hydropower This is an energy that uses water as a source. Water is a renewable resource, constantly recharge by the global cycle of evaporation and precipitation (Larry West 2010). Water is useful to generate electricity, such as to operate turbines and generators. Cunningham and Marry. (2008, page. 539) state that â€Å"Today American cities have some of the safest tap water in the world. Although many people are skeptical about their tap water, it is actually carefully monitored according to national safety standards, which is why water related epidemics are extremely rare in the United States despite concentrated urban populations. 4. Biomass Energy Materials that consider as biomass energy are wood, waste and hydrogen. This biomass energy can be used to produce electricity. 5. Geothermal Energy Geothermal energy is an energy that comes from heat inside the earth. This energy can be used to operate generators and produce electricity. There are two energy solutions. They are divided into two categories, which are energy conversation and energy efficiency. Energy conversation means using less energy. For example are switch off electricity when we do not use it and lowering speed while we drive. Berg and Hager (2009, pg. 462) state that â€Å"Energy efficiency is using less energy to accomplish a given task. † For example is measure in manufacture, such as fuel-efficient automobiles. Renewable energy is abundance on this earth, but still we have to use it wisely. Irresponsible behavior of human being towards environment can damage our earth. The impacts of what we did in the past or even today have not direct impacts that we can feel directly, but in the future.