At one Portland hotel, Earth Day isn’t a once-a-year event. Every day, The Doubletree Hotel diverts 68% of its waste stream from landfills, composts up to 17 tons per month and purchases more than half of their food products seasonally within a 500-mile region. You can even offset your travel footprint from the hotel’s website. As more hotels become eco-aware, they’re offering choices to families concerned about the environment. And some changes adopted industry-wide – like the option to skip washing your sheets during your stay – also save hotel-owners money. “Green travel has become part of mainstream travel,” says Brian T. Mullis, of Sustainable Travel International, a Washington State-based…