THE Federal Government faces a concerted campaign from a new coalition of health, environment and farm groups to ban genetically modified crops and foods until they are proved safe beyond reasonable doubt. More than 700 groups and individuals have signed a letter urging Prime Minister Kevin Rudd and senior ministers to meet a group of 20 experts to examine the health risks associated with GM foods. The fresh attempt to exert political pressure at the national level follows a controversial decision by Victoria and NSW to join Queensland in ending their bans on GM crops.