GM crops do improve yields in situations where they're called for: >He also told me that the overall yield data on GM crops isn't as simple as "yes, it produce

GM crops do improve yields in situations where they're called for: >He also told me that the overall yield data on GM crops isn't as simple as "yes, it produces higher yields" or "no, it doesn't". For instance, he pointed to a paper published this February in Nature Biotechnology which shows that GM corn sometimes out-produces conventionally bred corn and sometimes under-produces in comparison. The key is in the environmental context. The years where GM corn was producing similar or lower yields than conventionally bred corn were average years, when it came to factors like the weather, disease, and pests. It was in bad years that you can see a significant, positive, difference for GM corn. When the situation was bad, GM corn had greater yields. From http://boingboing.net/2013/03/29/do-gmos-yield-more-food-the-a.html http://boingboing.net/2013/03/29/do-gmos-yield-more-food-the... Then there's of course Golden Rice which has an increased content of Vitamin A, which you can't measure in terms of yield.