From the March issue: A recent Pew Research Center poll found that just 41 percent of the people questioned across the country named protecting the environment a top priority in their lives, down sharply from 56 percent a year ago. New Yorkers have been similarly reshuffling their priorities as the economy has nosedived. Just 12 months ago, when apartments were more about lifestyle than just living space, environmentally friendly LEED certification had become sexier than Gaggenau ovens. But lately it seems like the only amenity that turns anyone on is value. With penny-pinching now trumping saving the planet for many buyers, the question has become: Is investing in green systems a risky move?