Want to stay at an eco-friendly hotel when you travel? According to the Environmental Protection Agency, all you have to do is look for a certification mark on the hotel website. These third-party associations, like Green Seal or Green Leaf, certify green hotels based on their energy consumption, recycling programs, water conservation efforts and internal efforts to reduce waste at the property. It even counts the use of locally grown and organic foods for the on-site restaurants. Without these marks, it can be hard to identify if a hotel property is truly green, so either seal helps ensure you're staying somewhere eco-chic.