环境专家警告说，为防治害虫而大量施用的化学农药会严重破环臭氧层。为此，美国科学家现已研制出了天然农药作为替代品，以减少农药给臭氧层造成的破坏程度。甲基溴化物在广泛使用的农药中用量占第二位。由于其所含的溴甲烷对臭氧有很大的损耗，所以三年后将被禁止在美国本土 Environmental experts warn that chemical pesticides used in large quantities to control pests can severely deplete the ozone layer. To this end, the United States scientists have now developed a natural pesticide as a substitute to reduce the damage caused by pesticides to the ozone layer. Methyl bromide is second most widely used pesticide. Due to its contained methyl bromide has a great loss of ozone, so three years will be banned in the United States