First of all, let's clarify the word-combination "acid deposition" without using any chemical nomenclature. In other words, acid deposition is the process when huge quantities of acid accumulated in nature fall on our heads with rain, sleet, snow, and fog.  Acid also can be found in dry substances, for example in ashes and breeze. In point of fact, acid deposition is the common phenomenon, which accompanies some of the natural events (for example, volcano eruptions). In this case, acid deposition plays a positive role by reducing emissions of hotbed gas (metane) which make bogs. Point is that the human activity intensified and multiplied acid deposition up to the excessive level. So, it became one of the causes of acid rain. Acid rain is an extremely destructive form of pollution, and the environment suffers from its effects. Forests, trees, lakes, animals, and plants suffer from acid rain.  This phenomenon is not a recent one. In the 17th century, scientists noted the ill effects which industry and acidic pollution had on vegetation and people.

However, the term acid rain was first used two centuries later when Angus Smith published a book called "Acid Rain" in 1872. In the 1960s, the problems associated with acid deposition became an international problem when fishermen noticed declines in fish numbers and diversity in many lakes throughout North America and Europe. And now just fancy that more than 90 % of the sulphur and nitrogen oxides (which contribute to acid deposition) in the atmosphere is of human origin. It comes from coal burning, smelting of metal, exhaust and combustion of oil, coal and gas. Now we have to face the sad consequences of it. Let's briefly review only one of them - the acid rain. 

It is well-known that water is the most widespread substance in the world. Any human, as almost all essences on the Earth, on 80 % consists of water. More than that, water, in all it's conditions (liquid, firm, vaorous), always presents in human's life. So, it is clear that pollution of the most widespread substance in the world, will lead to the most extensive disaster. That is why the deterioration of water conducts to the deterioration of a human life. Nowadays we can't foresee all the consequences of water pollution, but the effects of acid rains have already become the terrible prevention for all of us. We can see how acid rain exerts influence on trees (leaves turn brown and fall off), lakes (become "dead", without fish and plankton), at long last, on ourselves, sneezing and coughing.

There are several measures to improve this situation, which should be undertaken in complex. First of all society must understand the acid deposition's causes and effects, because admitting the problem is one step to it's solving. Then smokestacks and exhaust pipes should be cleaned up. At the same time, people have to find the alternative energy sources. And finally, we have to restore the damaged environment.

From the all said above, it is clear, that nature is very susceptible to all human actions, and will not bear careless attitude to itself.