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.
Room service â Most cruise lines do not charge for room service, but many passengers provide a small tip upon delivery of food or drinks. Spa and gym â Some lines add a 15 percent auto-gratuity for treatments and even fitness classes; others leave any tip up to you.