Six countries produce nearly 60 percent of global carbon dioxide emissions. China and the United States combine for more than two-fifths. The planet's future will be shaped by what these top carbon polluters do about the heat-trapping gases blamed for global warming. How they rank, what they're doing:
Viking River Cruises Tipping Policy. It is customary to give cruise gratuities, subject to your satisfaction of services rendered. Gratuities on board and on land are not included in your full fare.
â¢â¢â¢ Cruise ships are a relaxing vacation, but newbies need to learn the rules of cruising, including the tipping policies. Jeff R Clow/Getty Images Tipping on a cruise ship has to be one of the most discussed topics about cruising.