( p53 ) : `` Although the sea , by absorbing carbonic acid , acts as a regulator of huge capacity , which takes up about five-sixths of the produced carbonic acid , we yet recognize that the slight percentage of carbonic acid in the atmosphere may by the advances of industry be changed to a noticeable degree in the course of a few centuries '' . ( p53 ) : `` Although the sea , by absorbing carbonic acid , acts as a regulator of huge capacity , which takes up about five-sixths of the produced carbonic acid , we yet recognize that the slight percentage of carbonic acid in the atmosphere may by the advances of industry be changed to a noticeable degree in the course of a few centuries . ''