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increase consumption of fossil fuels such as coal oil and natural gas has led carbon dioxide levels to rise dramatically over the last century and still they continue to climb but what effect could this increase in ambient co2 concentration have on our natural environment and an ecosystem such as this well weamp;#39;re here at the University of Birminghamamp;#39;s Institute the forest research to find out in this private area of woodland in rural Staffordshire an experiment of epic proportions is taking place this is by for face the free air carbon dioxide enrichment experiments the buy for face experiment consists of a series of ring structures each of which is over 30 metres wide and docHubes as high as the treetops canopy now each of these towers is supporting a pipe which is pumping out carbon dioxide in order to artificially raised co2 concentrations inside the ring to levels that climate change models predict we could be facing in 50 to 70 years time [Applause] plants of
