THE EARLY ANTHROPOGENIC HYPOTHESIS A YEAR LATER An Editorial Reply
نویسنده
چکیده
Ruddiman (2003) introduced a three-part hypothesis on early anthropogenic influences on late Holocene climate. He proposed that humans reversed a natural decrease in atmospheric CO2 values 8000 years ago by starting to clear forests for farms, that they reversed a natural methane decrease after 5000 years ago mainly by beginning to irrigate rice, and that they caused an anthropogenic warming sufficient to counter most of a natural cooling and avoided the onset of a new glaciation within the last several thousand years. This hypothesis has attracted considerable attention and some criticism (Joos et al., 2004; EPICA Community members, 2004). In this note, I comment on the current status of the hypothesis in the context of the issues raised by the two accompanying papers (Claussen et al., this volume; Crucufix et al., this volume). I conclude that the critics have not refuted the central argument of the hypothesis.
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تاریخ انتشار 2005