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.
Please see Princess Cruises Booking Conditions, or for more information about financial protection and the ATOL Certificate visit: www.atol.org.uk/ATOLCertificate. â Free drinks package applies to all Crown Princess Europe cruises departing from Southampton in 2017 booked by 31 May 2016, subject to availability.