Ha yes Farming but GM is a totally different kettle of fish and has only been around for 14 years and I would consider this too short a period for a trial period, try the life span of a human to get a clear picture
I guess it is 'how' the plants are modified is the 64million dollar question.
Whilst at college I learnt about triploid trout, which are 'technically' GM sterile trout.
A whole bunch of these escaped in the New York basin and decimated the local wildlife as because they did not breed, they put their entire lifetime focus into growing which dominated their rivals and ate everything. They also turned out to have much longer lifespans.
I learnt this in the '80's, but did not stay in touch with the subject. The moral is unexpected consequences.
Unless these GM plants are clones and sterile, and do not have any form of pesticide, then by their nature, must be a threat.
'if' the worry is bees pollinating these sterile plants, then they must have a reason for visiting, which may result in spreading plant material to other species.
Then there is the guarantee of the plant not having a faulty gene?
All clever stuff, but playing with fire in my opinion with a subject we are still learning about.