The U.S. National Center for Atmospheric Research (NCAR) has developed a climate model to test the effects of repeated volcanic eruptions, a period of fifty years.
I-US National Center for Atmospheric Research (NCAR) isungule imodeli yesimo sezulu yokuhlola imiphumela yokuqhuma okuphindaphindayo kwentaba-mlilo, esikhathini esiyiminyaka engamashumi amahlanu.