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.
If you go to the spa or salon on a cruise ship, check to see if a gratuity is included in your bill. Most often, spa staff aren't included in a ship's auto-tipping program so you should offer a gratuity separately. Cruise Lines with Auto-Tipping Policies. Carnival Cruise Lines: $12 per person per day.