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.
Cruise Ships. 1  Tipping is purely a personal matter and completely up to the guest. 2  $3.50 per day - For the dining room waiter. 3  $3.50 per day - For the cabin attendant.  $1.50 per day - For the assistant 1  waiter. 15% is normally added to all bar service.  At your discretion: Any additional service you may want to recognize.