There is limited to medium evidence available to assess climate-driven observed changes in the magnitude and frequency of floods at regional scales because the available instrumental records of floods at gauge stations are limited in space and time, and because of confounding effects of changes in land use and engineering. Furthermore, there is low agreement in this evidence, and thus overall low confidence at the global scale regarding even the sign of these changes. Projected precipitation and temperature changes imply possible changes in floods, although overall there is low confidence in projections of changes in fluvial floods. Confidence is low due to limited evidence and because the causes of regional changes are complex, although there are exceptions to this statement.
To be sure, there are some paragraphs in which they have medium or high confidence of this or that, for instance more people are killed by natural disasters when they occur in poor countries. Well, smack my ass and call me a monkey, good thing the UN spent millions on a showy conference in Africa to tell us that. It was in Africa of course, because that's where they want the rich countries making all the CO2 to send trillions of dollars. That is the purpose of the UN (if most of the members were honest enough to tell you).
Opportunities exist to create synergies in international finance for disaster risk management and adaptation to climate change, but these have not yet been fully realized (high confidence)
You can see the report for yourself here: http://ipcc-wg2.gov/SREX/
Too bad. Not very useful for making your claim.
Wikipedia claims "In terms of the global average, temperatures were probably colder than present day" during the Holocene climatic optimum (my emphasis), but admit that the optimum did not occur at the same time in the northern and southern hemispheres.
http://en.wikipedia.org/wiki/Holocene_climatic_optimum
PS. Good catch regarding the speleotherm data, but the graph based on it sure looks a lot like the one you linked to on Wikipedia, and both indicate a general downward trend (with the Medieval Warm Period as a slight deviation), and in fact, looking Wikipedia's 5 million year chart, there is clearly a long term downward trend during this current ice age, as well.
If you have a procedure with 10 parameters, you probably missed some.