The race to meet carbon-neutral biofuel targets could put human health and food crop production at risk unless it is carefully planned, according to new research.
A new study, led by Professor Nick Hewitt of Lancaster University, examined changes in ground level ozone in response to projected land use change associated with future biofuel cultivation.
Publishing in the journal Environmental Science & Technology, the researchers found that it would be possible to grow enough biofuel crops in Europe to meet EU biofuel targets but this could only be done relatively safely if the right crops were planted in the right places — away from highly populated areas.
Biofuels — usually derived from specialist crops such as poplar, willow or eucalyptus — offer alternative energy sources to carbon-intensive fossil fuels.
However, many plant species grown for biofuel emit more isoprene, an ozone precursor, than the traditional crops and vegetation they replace.
Too much ozone poses a well-documented risk to human health — 22,000 premature deaths are linked to ground-level ozone exposure in Europe every year. It can also damage food crops including two of the most commercially important food crops in Europe, maize and wheat.
Species of poplar with high biomass yields emit more isoprene than lower-yielding poplar. Planting large areas of higher yield poplar close to densely populated areas could result in increases in ground level ozone, which in turn could increase the number of ozone-related premature deaths.
Because background levels of ground-level ozone across Europe are already high, the study found that even small increases in ozone resulting from the large scale planting of poplar, willow or eucalyptus would add to the likelihood of damaging concentrations occurring.
Professor Nick Hewitt said: “In coming years we can anticipate a rapid expansion in poplar plantations in Europe driven by EU carbon-reduction initiatives. The current focus in policy-making circles and the biomass industry is on maximising yields but this should not be the only consideration. High yielding crops also produce the most isoprene and have the greatest impact on air quality and human health.”
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