The experts who now assure us that genetically engineered plants are harmless are the same experts who claimed that introducing non-native plants into the wild was a good idea  It is too late to be skeptical now that some non-native plants have become a serious problem
But we should conclude, while we still have time, that genetically engineered plants will also be harmful
The economists who tell us that the current economic expansion will soon be over are the same economists who failed to predict the end of the last recession. Wise investors will conclude that the expansion will continue for some time.