Read here. As is well known, the UN's IPCC Climategate scientists have endeavored mightily to produce a theme that Medieval Warming really only happened in the northern hemisphere, primarily within the European geography. Obviously, this IPCC fabrication has not been able to withstand the overwhelming scientific evidence that the Medieval Warming was global in nature, including South America.
"In the words of the research team, "the reasonably good correlation between our results (particularly SST) and other continental and marine archives from central-south Chile, Peru, and Antarctica ... confirms the occurrence of globally important climatic anomalies such as the Medieval Warm Period and the Little Ice Age." And, of course, their SST data indicate that the current level of warmth in that part of the world still has a long way to go before equaling the warmth experienced there a thousand and more years ago, which suggests that the region's current level of warmth is neither unprecedented nor unnatural..."