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.
Tipping and Service Charge Policies on Some of the Major Cruise Lines. 1  Holland America Line Tipping Policy. 2  Norwegian Cruise Line Service Charge and Gratuity Policy. 3  Oceania Cruises Tipping Policy. 4  Princess Cruises Tipping Guidelines. 5  Regent Seven Seas Cruises - onboard gratuities are neither required nor expected.