摘要
It has been estimated that the 1990s global annual mineral dust emissions were of the order of 1490±160 Tg yr-1.Mineral dust comes from a wide variety of sources through both natural processes such as wind erosion and volcanic activity,and many human activities.It has varied significant impacts on the environment,economies and society but also brings some benefits.Climate change and activities of growing human populations are affecting the nature and frequency of dust emissions and the levels of impacts.
