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.
Envelopes were passed out to the passengers and you presented the cash tip to the steward in the cabin and handed it to the wait staff at dinner. Some cruise ships still follow this policy, but most add a flat fee per day to your account which may or may not be adjusted downwards, depending on the cruise line. If the fee is required and cannot be adjusted downward, it is a true service charge and is no different than a port charge.