WHAT IS ACID RAIN?
You may think that 'acid rain' is a relatively modern concept, but it was actually first used over 100 years ago to describe worrying conditions in Manchester, England.
However, acid rain is certainly not a new phenomenon brought on by modern industrialization as all rainfall has a certain amount of natural acidity. It is just that pollutants released from industrialization increases this acidity a thousand fold! And don't think it's just rain you need to worry about as acidity can also be present - and be just as damaging - in snow hail, cloud, fog, mist and even air borne dust!
What causes acid rain?
Today we mine and burn fossil fuels in enormous quantities to generate electricity, heat our homes and power our factories. Unfortunately, burning fossil fuels releases releases huge amounts of pollutants - notably sulphur dioxide, nitrogen oxide and hydrocarbons - into the atmosphere.
Once they are in the atmosphere, sulphur dioxide, nitrogen oxide and the hydrocarbons react with sunlight to produce a selection of secondary pollutants such as ozone.
These secondary pollutants react with the sulphur dioxide, nitrogen oxide to form sulphuric-acid and nitric acid in the tiny droplets of water that go to make up our clouds. In this form the acids are carried on the wind to fall as 'acid rain' , often great distances away. Today, in spite of growing environmental awareness all around the world - and so is the damage caused by acid rain., large scale industrialization is still increasing.
The damage caused by acid rain
Even slight damage to a mature tree caused by pollution can be enough to kill it because it reduces the trees frost hardiness and its resistance to fungal and pest attack.
American studies have indicated that even where forests are showing none of the easily visible external signs of acid rain damage, pollution is nevertheless limiting their growth.
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Based on an article by http://en.wikipedia.org/wiki/Rainforest
Photo care of http://article.wn.com/view/2009/02/13/Government_to_tap_Brazils_agriculture_expertise/ and
Images care of http://aml0839.edu.glogster.com/environmental-effects/ and http://conservationreport.com/2010/06/21/acid-rain-is-increasing/