Europe faces “unprecedented risks” to its natural gas supplies this winter after Russia cut off most pipeline shipments and could wind up competing with Asia for already scarce and expensive liquid gas that comes by ship, the International Energy Agency said. The Paris-based IEA said in its quarterly gas report released Monday that European Union countries would need to reduce use by 13% over the winter in case of a complete Russian cutoff amid the war in Ukraine. Much of that cutback would have to come from consumer behavior such as turning down thermostats by 1 degree and adjusting boiler temperatures as well as industrial and utility conservation, the group said.