This international problem was first noticed by England and Canada. Later also in the USA, in the Scandinavian countries (Finland, Norway and Sweden) and in other countries like Czech Republic, Poland, Germany, Austria and Northern Italy.
This phenomenon has dramatically increased over the past few decades.
Many living and non-living systems has become harmed and damaged as a result of the acid rain. They are caused by the smoke and gases expelled by factories, airplanes and cars. When fossil fuels burn the sulphures are combined with oxygen and are transformed into sulphur dioxide and some of the nitrogen in the air becomes nitrogen oxide.
These pollutants bind to water and so chemicals fall back to the earth.
When trees get damaged by the acid rain their leaves and needles turn brown and fall off.
In the polluted lakes and rivers fish die and birds and mammals can be killed by eating them.
The only solution to this problem is to save energy and pollute less (or to use renewable energy). When less "dirty" energy is used, less coal is burnt and so there will be less acid rain.
(Thanks to Lorenzo S. for helping me writing this post)
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