If you want to accumulate more than 3.200 billion tons of CO2 emissions from the atmosphere, then by the end of this century, the threshold for controlling the temperature rise to within 20C will not be maintained. Some scientists believe that in order to achieve the goal of controlling the temperature rise to within 20C, only CO2 is restricted It is not enough. It is necessary to carry out large-scale atmospheric CO2 recovery operations on a global scale so that the degree of atmospheric pollution can be effectively controlled and mitigated. To make the above scientists' ideas work, which of the following needs to be added as the premise most? ['Universal scientific knowledge on climate change worldwide.', 'Governments introduce effective policies to control CO2 emissions.', 'The scientific community integrates resources to support the development of geoengineering technology.', 'Mechanisms are in place to effectively recover and store CO2.']