#Wikipedia has/had a big discussion on the safety of GMO food. When you read from what the Signpost has to say; it is only about the safety for people to eat this stuff.
The problem is that many promises have been made and this is only one issue, not even the most relevant issue. Read the article "20 years of failure" by Greenpeace or reads its rebuttal to what some Nobel Prize winners had to say.
The question if it is safe to eat is only one. The question if it will do us any good is more relevant. It does not bring us a more reliable food supply. It will not bring us more resiliency against climate change and it is very much in doubt that "golden rice" actually brings additional vitamins while a balanced diet does.
The important point of Greenpeace is that it backs its assertions with science. It is not in it for the money and its aim? A world that we can live in.