Anderson has contextualized the scale of such an impact in his other presentations but not here. A recent example is the temporary emission decreases due to covid 19. A 6.6% global decrease was determined from this study: https://www.nature.com/articles/d41586-021-00090-3#:~:text=After%20rising%20steadily%20for%20decades,on%20daily%20fossil%20fuel%20emissions. with the US contributing 13% due to lockdown impacts on vehicular travel (both air and ground). After the pandemic ends, experts expect a strong rebound effect.