Environmental Performance
See also: Environmental impact of shippingWhen designing Queen Mary 2, the designers aimed to reduce the ship's impact on the environment by improving fuel efficiency, and through better management of waste, not only to reduce fuel costs, but also to increase the service life of the ship, as it was predicted that tighter environmental regulations would be implemented while the ship was in service. Initial targets included the reuse of treated wastewater for non-potable uses and zero discharge of solid waste into the sea. For economic and other reasons, as well as in order to reduce energy consumption from incineration, some of these measures were not implemented. However, Queen Mary 2's environmental performance exceeds that of many older ships, as well as international standards on waste, as detailed further below.
According to Cunard, the ship exceeds the requirements of the International Convention for the Prevention of Pollution From Ships (MARPOL) of the International Maritime Organization. For example, it discharges waste into the sea only in areas more than 12 nmi (14 mi) from any coast, although MARPOL allows discharge of treated organic waste and treated bilge water closer to the shore. Discharges of potentially harmful substances, in particular the residual oil content of treated bilge water and air emissions, are monitored regularly in order to ensure compliance with environmental standards. In areas where air pollution from sulfur dioxide which causes acid rain is a concern, the ship switches to low-sulphur fuel in order to minimize air pollution.
According to the carbon offset company Climate Care, per passenger mile, passenger ships release more carbon dioxide into the atmosphere than long haul flights. However, Cunard attempted to reduce the carbon footprint of Queen Mary 2 by improving engine efficiency and reducing friction while the ship is in motion. In November 2008, the ship was given a refit in Hamburg, part of which involved the repainting of the hull in paint which is designed to reduce drag, and thus improve fuel economy.
Read more about this topic: RMS Queen Mary 2
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