Under current scenarios, most blue carbon sinks will be lost in the next two decades leading to a loss of annual carbon binding capacity equivalent to 4 - 8 % of the total anthropogenic input. (earthtimes.org)
More important, I think they would invite you to initialize hindcasts to simulate 20th century warming trends without anthropogenic input — so far, only inclusion of anthropogenic factors permit the models to emulate reality. (judithcurry.com)
These models use natural (e.g. solar) and anthropogenic inputs. (climate.uu-uno.org)