We often hear about solar cars, solar heating, and solar batteries. But will solar energy ever be a major source of energy for society?
Solar energy is cheaper than other fossil fuels because we can get an abundant source from the sun. in sunny desert area, 50% of the sun’s radiation that reach the ground could be used to produce electricity for businesses and industry and to provide heat, light, and hot water for homes. Experimental solar ponds can also produce hot water to drive generators.
Unfortunately, we can’t yet power our homes entirely on sunlight. Solar energy can only be used effectively in bright light. Its greatest potential therefore is in hot countries that have clear skies for most of the year. But, unfortunately most houses are not in the sunniest parts of the world. Moreover, in order to harness solar power solar cells are needed to convert sunlight directly into electricity. Solar cells are very cheap to run, but relatively expensive to buy and many people can’t afford them.
Needless to say, solar energy is useful and non-pollution source of energy. Unfortunately, solar cells, the main to harness the sun’s energy are still very expensive.
Nuclear energy is commonly offered as an alternative to overcome the crisis of energy. The debate of whether the use of nuclear energy is an appropriate choice has not come to an end. Some people agree with the utilization of it because of its benefits. Some others, however, disagree because of its risks to the environment.
Those who agree with the operation of nuclear reactors usually argue that nuclear energy is the only feasible choice to answer the ever – increasing energy needs. In their opinion, the other sources of energy: oil, coal, and liquid natural gas are not renewable and safe, while nuclear energy can be sustainable when produced in a safe way.
However, people who disagree with the use of nuclear energy point out that the waste of nuclear products can completely destroy the environment and human lives. A meltdown in reactor, for example, usually results in the contamination of the surroundings soil and water. Take for example, the blow up of the nuclear reactor at the Chernobyl Nuclear Power Station in Russia twenty years ago. The serious contamination imperiled people and the environment severely.
It is obvious that nuclear energy should be avoided because it really endanger the environment but what about a less polluted energy instead of nuclear energy? Are there any alternative energy to overcome the crisis of energy?
In this modern era, technology has developed to such a certain degree that scientists are able to create new forms of life. One of them is cloning. The debate whether cloning of animals should be allowed or not seems endless.
Those who agree with cloning of animals usually argue that the cells produced from them can be used to stop animals from becoming extinct. They also add that cloning has a purpose to produce high quality of cells.
Many species are becoming rarer and rarer. Scientists are concerned if they don’t do something to save certain species, these animals will be extinct forever and this would be a big loss for the animal kingdom. For this reason, researchers have improved cloning technology so that many rare species can be successfully cloned.
However, not everyone is excited about cloning animals. Some people feel that it could have terrible consequences.
For example, if dinosaurs are cloned, then men could be extinct. It is clear that these ferocious beasts cannot live together with humans. In history, these creatures lived several thousand years before men appeared. Can you imagine these giant killing creatures living within the same era and on the same planet with us?
As a result of this controversy, people still haven’t got the answer yet for cloning animals. Moreover, some members of the scientific community think that the banning of cloning technology will destroy the creativity of science.