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Yes its cool that poor places can grow rice easy etc now but what isn't cool is that the seeds of these plants spread and so the GM crops will out do the "normal" plants. This will screw things up sooner or later since its messing with the natrual ecosystem of how things are supposed to work.
So all the rice is now toxic or a deterant to whatever bugs used to eat them, what happens when all those bugs die cause they can't eat the rice anymore, what happens to whatever used to eat those bugs? Boom.
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Usually this kind of GM crop is restricted from flowering and prevented from breeding genetically, so they can only be reproduced by cloning (which can easily be done in plants by snipping pieces of currently existing plants etc.).
There won't be many insects that reliable on rice as it is usually grown in places where it doesn't naturally occur. In other cases, those insects usually still have access to other food sources as well.