During periods of frequent earth tectonic activities, new ocean basins around Africa, South America, and Europe began to expand, creating new spaces. A large amount of carbon dioxide in the atmosphere reacted with photosynthetic organisms, and dead organisms were subsequently buried in seabed sediments and thus formed carbon-rich shale. The carbon in the atmosphere is fixed, making the level of carbon dioxide in the atmosphere drop, reducing the greenhouse effect and lowering the global temperature, which is a very serious consequence for marine life. 
Global warming will lead to an ecological crisis of marine life. Scientists have found that a similar crisis occurred in marine life during the period of global cooling 260,000 years ago.
 scientists believe that the consequences of global cooling or warming are equally serious.