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Today - in the modern world, which affect on the environment in many ways, serious trouble appeared. The problem is that industry style of life, through many years, has influenced on climate and all nature very badly.
The worst influence comes from industry - factories from all over the world produce smoke, which diffuse in the atmosphere. So air we breathe is full of toxic chemical as carbon dioxide, carbon monoxide, nitric oxide, sulphoxide and many others. All of these facts affect in greenhouse effect. This name discribes the process called also global warming. The Earth receives energy from the Sun in the form of radiation and then reflects about 30% of the incoming solar radiation. The remaining 70% is absorbed, warming the land, atmosphere and ocean. The other effect is called acid rain - when it is raining, all the gases and dust from the air is absorbed and makes rain toxic. Then acid rains destroy crops. decrease in stratospheric ozone over Earth's polar regions during the same period. However the Earth has natural way to defend. All of the plants absorb carbon dioxide from the air. It helps to keep it clean and healthier. But people by cutting Equatorial Rain Forests destroy this natural way of Earth defense system. We have extremely bad influence to the nature by producing freon based devices.
To sum up people would even destroy the life on our planet if we haven't changed the style of life and become more proecological.