A month ago, global exports of liquefied natural gas hit an all-time high. They’re about to grow further, however, as winter in the northern hemisphere draws nearer and demand for heating soars. The first signs are already showing: LNG tanker rates are surging, gaining over 50% in the past week. A week ago, the average daily rate for a 174,000-cu m LNG carrier crossing the Atlantic stood at $39,750, Reuters reported, citing figures from pricing data provider Spark Commodities. This Monday, that daily average had surged to $61,750, before…