7 6 Global carbon dioxide turnover – Around 20 billion tonnes of carbon dioxide are constantly transformed in the earth’s natural cycle. – An additional 36 billion tonnes of carbon dioxide annually are released from fossil fuels as a result of human activity. How much carbon dioxide is bound per year? – One square metre of forest binds one to two kilograms of carbon dioxide. 1 – One square metre of maize binds one to three kilograms of carbon dioxide. – One square metre of algae without automation technology binds around ten kilograms of carbon dioxide. – One square metre of algae in the photo-bioreactor from Festo binds over 100 kilograms of carbon dioxide. 2 How much biomass is produced? – One hectare of forest yields around twelve tonnes of biomass per year. 1 – One hectare of maize yields around nine tonnes of biomass per year. – One hectare of algae in the photo-bioreactor from Festo could theoretically yield around 70 tonnes of biomass per year. 2 How much water is required? – One kilogram of wood requires around 1,800 litres of water. 1 – One kilogram of maize requires around 900 litres of water. – One kilogram of algae in the circulation system of a photo- bioreactor requires around ten litres of water. 1 regional differences 2 converted equivalent value
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