By Tobias Carroll For 11 days in February 1960, the Winter Olympics took place in Lake Tahoe. As befits a Cold War-era Olympics, the Soviet Union and United States racked up the most medals, followed by Germany, Finland and Sweden. Unique among Winter Olympics before or since, there was no bobsled competition to be had. But the 1960 Winter Games also hold another unsettling distinction: 60-plus years later, the local temperature will soon make holding a repeat event there impossible. That’s the biggest takeaway from an unsettling report from The Mercury News. A group of researchers from Ontari…