It gets as cold as minus 20 degrees Celsius by December in Harbin,making the capital of northeast China’s Heilongjiang Province a hotbed for ice-and-snow-themed activities every winter.Ice block cutter Huang Wu led seven of his fellow villagers to saw huge blocks of ice on the surface of the Songhua River into 200-meterlong ice floes before breaking them down into 0.8-by-1.6-meter blocks.