The Zachos, Dickens & Zeebe January, 2008 article points to an urgent
need for the human race to take immediate steps to deal with
anthropogenic global warming.
NATURE|Vol 451|17 January 2008|doi:10.1038/nature06588
James C. Zachos, Gerald R. Dickens & Richard E. Zeebe
"Past episodes of greenhouse warming provide insight into the coupling
of climate and the carbon cycle and thus may help to predict the
consequences of unabated carbon emissions in the future."
"To evaluate climate theories more thoroughly, particularly with regard
to feedbacks and climate sensitivity to pCO2, it is desirable to study
samples obtained when CO2 concentrations were high (approaching
or exceeding 1,800 p.p.m.v.) and to make observations for intervals
longer than those of ocean overturning and carbon cycling (more
than 1,000 years)4. Earth scientists have therefore turned increasingly
to ancient time intervals," ...
... Figure 1. "Response to massive carbon input. A simulation of
atmospheric CO2 (a), ocean surface pH (b), ocean surface calcite
saturation (c) and deep-ocean temperature changes (d) in response to
the input of 5,000 Gt C of anthropogenic CO2 into the atmosphere,
starting from pre-industrial CO2 levels (around the year 1860)."