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.
Each party has a server, assistant server and head server. This team follows the party into each of the three main dining restaurants to maintain service consistency. As of February 2010 the recommended tips for a three-day Disney cruise are $12 for the server, $9 for the assistant server and $3 for the head server.