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.
Cruise Ships. 1  Tipping is purely a personal matter and completely up to the guest. 2  $3.50 per day - For the dining room waiter. 3  $3.50 per day - For the cabin attendant.  $1.50 per day - For the assistant 1  waiter. 15% is normally added to all bar service.  At your discretion: Any additional service you may want to recognize.