Europe’s benchmark natural gas prices rose on Monday as demand increased during a cold snap in northwestern Europe and supply from Norway was expected to slip to a two-month low. The Dutch TTF prices rose at the start of trade in Amsterdam before swinging to losses by mid-morning. Last week, prices rose for the first weekly gain in several weeks amid expectations of colder weather in the big gas-consuming countries in northwestern Europe. Before that, Europe’s benchmark gas prices had slumped to the level last seen before the Russian…