The Earth is the only one place in the solar system where there is life. But today our planet is in serious danger. Acid rains, global warming, air and water pollution, overpopulation are the most threatening ecological problems. They are the results of human’s activity. We should realize that we are all responsible for our planet and we must think about the future of the world we live in.
Climate scientists are telling us that gases like carbon dioxide are causing global warming. Carbon dioxide is produced when petrol is burned in your car engine, or when coal and gas are burned at power-stations to make electricity. Carbon dioxide causes global warming because it contributes to the so-called greenhouse effect. So what is greenhouse effect?
The exchange of incoming and outgoing radiation that warms the Earth is often referred to as the greenhouse effect because a greenhouse works in much the same way. Pollution sends 4 main “greenhouse gases” into the atmosphere. These are Carbon dioxide, chloro-fluoro-carbons, methane, nitrous oxide.
The man has destroyed more than 80% of the Earth’s forests. However, at last we are beginning to understand that the key role which forests play in keeping us alive. Plants produce oxygen and remove carbon dioxide from the air. Deforestation increases the amount of carbon dioxide in the atmosphere. As carbon dioxide is one of the greenhouse gases we should control its amount even by saving forests. So it’s really important to protect forests from deforestation.
If we speak about wild animals they’re also in danger. Many species of animals and birds are disappearing nowadays. People kill animals for different aims: people hunt whales for their meat and oil; elephants for their tusks, crocodiles for their leather and so on. In addition, animals are used for medical experiments. The most wide – speared from such animals are monkeys. Modern life is bad for animals, birds, fish. The air isn’t fresh and the water isn’t pure. They don’t have good meal and facilities for the life.
The ozone layer prevents most ultraviolet (UV) and other high-energy radiation from penetrating to the earth surface but does allow through sufficient ultraviolet rays to support the activation of vitamin D in humans. The full radiation, if unhindered by this filtering effect, would destroy animal tissue. Higher levels of radiation resulting from the depletion of the ozone layer have been linked with increases in skin cancers and cataracts and have been implicated in the decline of certain amphibian species.
During the mid 1980s, concerns grew over what appeared to be a ‘hole’ in the ozone layer over Antarctica in spring. Scientists determined that the ‘hole’ was caused by humans due to man-made chemicals such as CFCs (chlorofluorocarbons). The CFCs and other chemicals were interacting with the ozone and destroying the layer over Antarctica. A smaller hole was also seen over the Northern Hemisphere. Initially, it seemed impossible that CFCs could reach the stratosphere as they were heavier than air. However, weather phenomena like thunderstorms can produce updrafts and carry air (and other) particles to the top of the troposphere and even into the parts of the stratosphere.
Damage to the ozone layer can also be caused by sulfuric acid droplets produced by volcanic eruptions.
Speaking about energy resources it’s very important to remember about alternative resources. Our planet has limited supplies of fuels such as coal, oil or natural gas, which cannot be replaced. The sooner we start using alternative energy sources, the better. We should make more use of solar power. The sun provides a great deal of energy which we are not using. A good idea would be to use the power of the wind to generate electricity. We could exploit nature without harming it. We can use geo-thermal power – the energy from the hot rocks and water at the center of the Earth.
Saving certain recyclable materials and taking them to recycling centers has become part of the daily routine in many homes. It is important that people realize the damage our rubbish does to the environment. Our towns and cities are becoming more and more polluted with household waste. This can easily be prevented if people took time to save and recycle their rubbish. Thousands of trees are unnecessarily felled to make paper products. Again, by recycling the paper we would otherwise throw away we could reduce this loss.
First of all we should remember that our planet is our home. Everyone wants to have a clean home. That’s why we should take care of our home