Acid rain is a result of air pollution. When any type of fuel is burnt, lots of different chemicals are produced. These can mix in the atmosphere and fall to earth with water droplets. 

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Restoring the damage

Lakes and rivers can have powdered limestone added to them to neutralise the pH of the water - this is called "liming". Liming, however, is expensive and its effects are only temporary - it needs to be continued until acid rain stops. The people of Norway and Sweden have successfully used liming to help restore lakes and streams in their countries.

A major liming programme took place in Wales where 12,000 km of its waterways were acidified.  In 2003 liming of the river Wye led to a return of the salmon which had completely disappeared in 1985.  However, other parts have taken longer to recover and there are still no signs of life.

Recently a more positive side of acid rain has been noted as it can be very effective at reducing the natural production of methane, a “greenhouse gas” approximately 23 times more powerful than carbon dioxide, especially in wetland areas.  The sulphur in acid rain limits the activity of methane-producing microbes found in wetland areas. (New Scientist)

Read More: What can we do to help?

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