‘Fears for the Future’ so do something NOW
By Claire V J Skipper, on 8 June 2011
Dear All,
My first Cheltenham festival day of lectures seemed full of fears for the future. Mark Maslin (head of the Department of Geography at UCL) chaired ‘The Limits of Our Planet’ and the closely related ‘Acid Acidification’, and then Andrea Sella (UCL Department of Chemistry) was the experimental star of ‘Endangered Elements.’
‘The Limits of our Planet’ highlighted that we have already passed the sustainable limit of our planet in terms of the rate of biodiversity loss, climate change and the nitrogen cycle. More than 100 species for every million become extinct at the moment, which in my mind is 100 above the ‘acceptable level’, but the experts have put the ‘acceptable level’ at 10. Climate change was measured on the amount of carbon dioxide in the atmosphere, which gets enough media attention for everyone to know that it needs reducing. The nitrogen cycle is less well known and the amount of nitrogen that humans take out of the atmosphere to use as fertiliser is at 121 million tonnes per year compared to the sustainable level of 35.