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.
Tips are not included in your cruise price, but are a voluntary way of showing satisfaction for good service. You may tip onboard staff in cash if you like, or you may charge your tips to your credit card at the end of the cruise (everywhere except Egypt, Southeast Asia and Portugal).