Despite the rapid adoption of genetically modified (GM) crops by farmers in
many countries, controversies about this technology continue. Uncertainty
about GM crop impacts is one reason for widespread public suspicion. Wilhelm
Klümper and Matin Qaim from the University of Goettingen (Germany) have
carried out a meta-analysis of the agronomic and economic impacts of GM
crops to consolidate the evidences. The analysis covers 147 original studies
that were carried out internationally over the last 20 years. On average, GM
technology adoption has reduced chemical pesticide use by 37%, increased
crop yields by 22%, and increased farmer profits by 68%. Yield gains and
pesticide reductions are larger for insect resistant crops than for
herbicide tolerant crops. Yield and profit gains are higher in developing
countries than in developed countries. The meta-analysis reveals robust
evidence of Gm crop benefits. Such evidence may help to gradually increase
public trust in this technology.

[dx.plos.org].