In the 1930s, people began experimenting with DDT, invented by Swiss chemist Samuel Muller. Just as people are congratulating themselves on finding a highly effective pesticide that kills pests, their natural enemies are nearly gone. At the same time, DDT residues can be accumulated for a long time, has caused endless worldwide public hazards.
justified?
Some scientific achievements are double-edged swords, so we should be cautious about using them