“…The anthropogenic greenhouse effect has caused and will continue to cause significant changes in the global climate (Pachauri et al, 2014; MacDonald, 2017). Although natural warming has occurred in past periods, such findings may not provide approximations for the current or near future climate, because their forcing factors are natural phenomena (Mann et al, 2009; Mayewski et al, 2004; Renssen et al, 2009).…”