Reply to comment by W. F. Ruddiman on "A note on the relationship between ice core methane concentrations and isolation"

Abstract

In summary, we continue to maintain that in the absence of further studies ruling out boreal wetlands, tropical river deltas and peat lands as sources of the late Holocene increase in CH4 emissions, a definitive attribution [Ruddiman, 2005b] of this trend to anthropogenic sources is premature. Copyright 2005 by the American Geophysical Union.