Royal Caribbean has an agreement with shipbuilder Meyer Turku to construct its new "Icon-class" of liquid natural gas-powered ships, which should be ready for 2022. These ships will also be equipped with fuel cells and should release fewer emissions. The company recently signed a 12-year deal to offset 10 to 12 per cent of its carbon emissions through a 200MW Kansas windfarm. Despite these measures, some still fall foul. Pacific Explorer spilt 27,000L of food waste and grey water into the Great Barrier Marine Park in August. Parent company Carnival Australia was forced to provide a "$2.1 million undertaking". But on other measures, Carnival, which carries more than 12 million passengers a year worldwide, says it is ahead of schedule, having reduced emissions by more than a quarter compared with its 2005 baseline. The company has two cruise ships that can use LNG while in port while in December, its 6600-passenger AIDAnova became the first cruise ship that can be completely powered using LNG.