Cold-water laundry detergent is a hot idea

摘要

Household laundering takes a lot of energy-not even counting what's required to haul the loads up and down stairs.In the U.S.and Canada,most of that energy is used to heat water for laundry detergents designed to work with warm water.But earlier this year,Procter & Gamble(P&G)launched Tide Coldwater,a version of its popular laundry detergent that is designed for good cleaning in cold water.