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.
Credit cards are accepted in most medium-size and larger businesses, particularly in tourist areas. A 10% tip is normal in hotels and restaurants. Check your bill carefully â some restaurants automatically add a 10% to 15% service charge. Some all-inclusive resorts have a strictly enforced no-tipping policy.