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:
River cruise companies also have their own tipping policies. A handful, such as Scenic Tours, Avalon Waterways and Tauck, include gratuities in their overall price, while Viking River Cruises recommends that guests tip at the end of the trip at a rate of between Â£5 and Â£10 a day.
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.