G A (Genetically Alterted) OK but Wind Turbines could be a health hazard

Rode about 100km today finishing in London. Noticed along the highway in farmyards numerous signs against the coming of the wind turbines (all these signs were the same one as in my photo) but almost all the farms with the wind turbine signs had G A labels (photo) on the crops that they were growing??? Photo of BLUE sky that I was riding in too.