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.
Many vouch that this is the ultimate way to rack up onboard credit for that next sailing. Celebrity Cruises offers up to $500 per cabin when you book your next cruise onboard. If you make a deposit toward a future cruise on Norwegian, you earn $100 in onboard credit to spend instantly on the cruise you're already on.