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.
Viking River Cruises is largest river cruise line in the world. The extensive fleet is designed to navigate the worldâs great rivers sailing in Europe, Russia and the Ukraine, Egypt, China, Vietnam and Cambodia. When compared with its competitors, Viking is the most aggressively expanding river cruise line.