Okay, that makes sense. But I don't believe in the failure to increase yield. It seems inevitable to me that yields are going to be increasing over the years. I haven't dug into your link, but I wonder how they were measuring yield and whether it was normalized or something.
I only skimmed the report, but it doesn't say that GM crops failed to increase yield. It says they have increased it, just that the increase is not large; and not big enough to meet the growth in demand nor justify the expense.
They're a bit vague on how they selected the studies they used the collate their figures - they do discuss that it's important to select the best studies, but neglect to inform us how that is done, which casts a dubious shadow over the report, to my mind.
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