During the period when the Earth's tectonic activity was frequent, new marine basins around Africa, South America, and Europe began to expand, creating new space. A large amount of carbon dioxide in the atmosphere reacted with photosynthetic organisms, and the dead organisms were subsequently buried in seabed sediment The formation of shales rich in carbon elements, the fixation of carbon in the atmosphere reduces the level of carbon dioxide in the atmosphere, reduces the greenhouse effect and reduces global temperature, which is a very important consequence for marine life, so some Scientists believe that the consequences of global cooling or warming will also occur. Which of the following is true and best supports the judgment of scientists? ['After 200 years of global chilling, due to frequent volcanic eruptions, the carbon solidified in the shale was generated into the atmosphere as C02, and the greenhouse effect was partially restored.', 'Global warming can lead to a crisis of marine life, scientists have found that similar crisis occurred in marine life during the period of global cooling 260,000 years ago.', 'Natural changes in large-scale growth periods or huge changes in the global greenhouse effect in the short term due to human activities have an impact on the entire system.', 'Scientists have observed that climate cooling has occurred over millions of years instead of tens, or hundreds of years, which is still difficult to associate with our rapidly changing modern climate conditions.']