I don't claim to know much about the science of GM crops but as a development economist by background I was brought up on the 'green revolution' and the transformation of Asian agriculture from the 1950s onwards. This article gives an interesting perspective from Prof Sir David King, recently retired Chief UK Government Scientist:
I can do the economics but the science of agricultural business is not my strong point! And I have been of the view that the continuing failure (at least relatively) of Africa is perhaps the biggest issue with the most pressing need for resolution facing us at present.
I'm sure I'll get some disagreement with the presumption but in and amongst some real science of GM crops would be really helpful.