Reuters: Three-quarters of Americans, the world’s largest polluters, plan to be more environmentally responsible in 2008 by reducing household energy or recycling more, a survey showed on Monday. Half of those polled said they would make a "green" New Year’s resolution, according to the survey by GfK Roper and commissioned by marketing consultancy Tiller LLC. Two-thirds of Americans plan to cut their use of household chemicals, while 42 percent said they would take reusable …