There are no walls that stop modified pollen from spreading death. Monstanto made terminator seeds that do not grow viable seeds. This is a clear and present danger to spreading a die off of accidental hybrid nearby crops. Of course Monsanto claims this is a myth. http://www.globalresearch.ca/the-seeds-of-suicide-how-monsanto-destroys-farming/5329947
In 1970 the UK made a movie of a global die off of all grains called no blade of grass. They had some technical plot problems but the dangers are greater today.
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I have imagined giant fruit that was so good the dinosaurs made them go extinct. How about watermelon sized favorite fruits?
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