( p54 ) : `` By the influence of the increasing carbonic acid in the atmosphere , we may hope to enjoy ages with more equable and better climates , especially as regards the colder regions of the earth , ages when the earth will bring forth much more abundant crops than at present , for the benefit of rapidly propagating mankind '' . By the influence of the increasing percentage of carbonic acid in the atmosphere , we may hope to enjoy ages with more equable and better climates , especially as regards the colder regions of the earth , ages when the earth will bring forth much more abundant crops than at present , for the benefit of rapidly propagating mankind . ''