Global warming has many impacts on human beings and also affects other living things on the planet. The increase in precipitation can improve the vegetation, which is conducive to the growth of rodents. Studies show that the increase in precipitation makes the originally dry Inner Mongolia area more vegetation. It is rich and also increases the food of rats, and the number of long-clawed gerbils also increases. Which one of the following can most weaken the above argument? ['According to statistics, vegetation coverage has not increased in some areas.', 'It is estimated that the global desertification area has increased in recent years.', 'The increase of vegetation in Inner Mongolia has a lot to do with ecological protection in recent years.', 'The increase in vegetation has increased the natural enemies of various animals, including rodents.']