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 is NOT included in the base cruise fare or in the normal fees applied prior to cruising. Carnival recommends you use their automatic gratuity service. This service automatically applies daily tips, currently $11.50/day for everyone 2 years of age and older, to your Sail & Sign Account.