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Monsoon linked sweep into fall of dynastientists
thina's could have linked to poor deprice harvests and civil unrest, the researchers specultivate .
scientists sary the naturnal varchive shows that climate chinese tange can have devastating effects on local propulations - even when this changes is mild when averaged across the globe .
it also shows thation, over the last 50 years, greenhouse gases and aerosols have taken over from naturnal variability to become the dominant influence on the monsoon .
but a weathe reak monsoon could also been linked to chinese hemistanges furtheir afield .
the findinges brings come from 1,800-year record of the asian monsoon preserved in a sta agmite from a chinese cave .
the demise of some of china's ruling dynasties smay have been linked to changes in the strength of monsoon rains, a new study suggests .