Yo, Dick...

One very major negative effect that GMOs have is on the environment with more chemicals now being sprayed than ever... When it rains these chemicals end up downstream in streams, lakes, ponds, rivers, bays and eventually the oceans... That negatively effects creatures that live in or around water and effects the water itself...

The other negative effect of GMOs is that small farmers are being threatened with law suits if bees carry the DNA from one filed to another... What this does is force mom 'n pops outta business who then have to sell their land to agri-business...

As for the physical effects on humans, we don't know for sure yet... Given the higher levels of pesticides on crops certainly doesn't make them more attractive...

B~