Philip Carson of Calgary writes regarding, "Controversy growing around GM crops," Harry Sterling, Opinion, Aug. 7, to say that if there is controversy, it is caused by the relentless fear-mongering of environmental activists. The concerns the activists have about genetically modified crops have been proven false. 

Yet, despite strong scientific evidence that these crops are harmless to humans and good for the environment, they are able to hide behind empty slogans. 

When science proves them wrong, they invoke the intellectually bankrupt "precautionary principle." When they are unable to formulate a coherent argument, they simply claim something is not "sustainable," whatever that means.

Carson says he encourages all rational people to reject the superstition that passes for environmentalism by refusing to consume anything labelled as "organic," just as rational people refuse to be worried about black cats and broken mirrors.