A single mature beech tree can lock up a kilogram of carbon dioxide every half hour and produce enough oxygen for 10 people in a year.
Each mature tree can 'fix' 17 tonnes of carbon dioxide in a year.
Or put another way 300 trees can generate enough oxygen for a small town like Kirriemuir.
According to Government statistics, poor air quality causes between 12000 and 24000 premature deaths a year in the UK. World wide, carbon emissions have risen by over 25% since the industrial revolution and they are by far the largest of six deadly greenhouse gases which bring about global warming.
In our country, whilst carbon emissions have fallen in the last 30 years, the proportion of carbon dioxide produced by cars and lorries has more than doubled. Given that the volume of road traffic is set to increase by 28% by 2011, the need to plant new trees and woodlands is clear.