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  Carnival Cruise Lines Tipping Policy. 2  Celebrity Cruises Tipping Policy. 3  Crystal Cruises Tipping Policy. 4  Cunard Line Tipping Policy. 5  Hapag-Lloyd Cruises - Tipping is not obligatory on board. Acknowledgment of particularly good service is at the discretion of each guest.