Many places around the world are facing disasters caused by drought, and people are often overwhelmed by these disasters. Today, some scientists have discovered a laser. After launch, it can create water droplets in the air, which will increase the vapor and increase the moisture in the clouds Bring rainfall, which they believe will help people determine rainfall and time and replace traditional methods of artificial rainfall. Which of the following, if true, would most weaken the conclusion? ['The study found that the effects of lasers of different wavelengths on the cloud are inconsistent, and the traditional method is easier to operate than the laser rainfall method.', 'Some studies believe that rainfall in an area is mainly affected by changes in weather patterns, and the use of lasers cannot achieve rainfall anytime, anywhere.', 'Concentrated rainfall is easier to achieve in low-temperature and high-humidity environments, and it is necessary to continuously emit greater intensity lasers in natural arid environments.', 'Artificial rainfall mainly relies on chemical substances to condense rainfall, which will cause some damage to the environment, but the laser does not cause harm to the environment.']