We do not know how much of the recent rise is caused by human activities. Some of the recent rise, associated with the shrinking of glaciers, is not caused by human activities, since the glaciers have been shrinking for hundreds of years while human activities became significant only in the last century.
在过去200年间，人类发明了检潮仪这种紧密测量工具，而海平面依然在继续缓慢升高。究竟有多少最近海平面的上升是因为人类活动引起，我们无从得知。有些近期的升高同冰川萎缩有关，并非由人类活动引起。毕竟冰川融化的过程已经持续好几百年了，而人类活动产生的效应仅仅于上世纪才变得显著起来。