I've been reading Bill Nye's book Evolution Undeniable.  Bill Nye is very pro science, yet he urges caution with genetically modified foods. This is interesting because I've heard many people scold me when I express doubts about GMF, "are you anti-science"?
Yet, the opposite is true, Bill Nye uses science, his understanding of evolution, and ecosystems to explain the potential environmental harm from GMF. Ecosystems are very complex and took hundreds of thousands of years to evolve. That researchers can know what happens to the specific corn or soy plant, but will likely miss a subtle detail in the Eco-system impact.
Nye also gives specific examples of monarch butterflies and allergies to GMF. With the butterflies they are under attack in two ways, first the corn plant is resistant to Roundup herbicide meaning more spraying of herbicide killing the milkweed plant the butterflies need. Second, the GM pollen may blow from the corn plant onto the milkweed plant harming the monarchs directly.
As for allergies, papaya fruit eaters reported an allergy to the GM (genetically modified) version but no such allergy to the non-GM version.  page 234 paragraph three.
In conclusion, Bill Nye thinks that GMF are controversial and should be according to his book.  Finally, Nye is fine with hybridization, for example crossing two different variations of wheat crop.
Bill Nye changed his stance since the publication of his book. Perhaps the truest part of being scientific, basing your opinions upon empirical evidence, is that as the evidence changes so does your point of view.