If the cumulative amount of CO2 emitted to the atmosphere exceeds 3.200 billion tons, then by the end of this century, the threshold for controlling the temperature rise to within 20 degrees will not be maintained. Some scientists believe that in order to achieve the goal of controlling the temperature rise within 20 degrees, Limiting CO2 emissions is not enough. It is necessary to carry out large-scale atmospheric CO2 recovery operations worldwide to effectively control and mitigate the degree of atmospheric pollution. To make the above scientists' ideas work, which of the following needs to be added as the premise most? ['niversal scientific knowledge on climate change worldwide.', 'overnments introduce effective policies to control CO2 emissions.', 'cientific community integrates resources to support the development of geoengineering technology.', 'Mechanisms can be established to effectively recover and store CO2.']