Nonsense.Archeological data from farming terraces in Chile and China as well as pollen samples from Russia indicate the warming was global. These farming terraces are at altitudes that are too cold for farming now, but SOMEONE was farming them once.
At the same time, a drought of cataclysmic effects probably was the death knell to the Mayan culture. This also suggest the effect was not limited to Europe.
The Vikings established a colony on Greenland that flourished for 200 years. The southern third of Greenland was covered in lush green grasslands (hence the name Greenland) and the Vikings raised livestock and farmed crops. Only the little ice age drove them out. Its not coincidence that the ascendency of the Norse culture occurred at this time.
Around 1100AD they were making such good wine in Scotland the king of France banned imports of British wine.(you cant grow grapes in Scotland now, its too cold)
During the MWP the population in Europe exploded, mostly because the climate was so favorable to agriculture. When the little ice age hit, crop after crop were lost and millions of people starved to death.
During the little ice age the Hudson and Delaware rivers in America and the Thames river in England froze over every winter, something that never happens now.
The historical record proves that the climate warms and cools all on its own in a natural cycle. If history teaches us anything, its that we should be much more concerned about a cooling climate then a warming one.
Dr Andrew Glikson, visiting fellow at the School of Archaeology and Anthropology, Australian National University
I think the scale of the changes being seen now when compared to the Earth's history is something the media and the public do not appreciate. Earth's history is marked by a number of major mass extinctions of species, triggered by volcanic eruptions, asteroid impacts and release of methane from sediments.
Major shifts in the state of the climate were caused either by pulsations in solar radiation or by release of carbon from the Earth. In each of these events a marked rise occurred in the concentration of greenhouse gases in the atmosphere.
As the level of energy and temperature of the atmosphere increased, irreversible tipping points were reached where the synergy of feedback processes ice melt, warming water, released methane, droughts and fires - combined to shift the climate from one state to the next.
The current rise in energy of the atmosphere above that of pre-industrial times, by about 3 Watt per square meter, is about half that of the atmospheric energy rise during the last transition from glacial to interglacial state.
The current shift is threatening to bring about irreversible tipping points in the climate, with the most serious consequences, likely indicated by the increase over the last 20 years or so in the intensity of extreme weather events around the globe.
The current rise of atmospheric CO2 at a rate of near-three parts per million per year exceeds rates recorded in the history of the atmosphere for the last 55 million years, which retards the ability of species to adapt to environmental change in time.
A consequent shift from conditions, which have allowed agriculture to take place from about 8,000 years ago, would render large parts of the continents unsuitable for cultivation.