Green Cruise Ships?

I found a brief article on how some cruise liner companies are putting "their heads and wallets together" to think of ways to make their cruise ships more environmentally friendly. The article gives the names of the companies and the ships they've made which are more "green". We should cross reference to see if any of these ships will be stopping in Venice while we are there.

Oceana

Oceana is a non-profit organization that tries to preserve ocean waters. They conducted experiments on Cruise ships and came up with data on how cruise ships contaminate waters. I think this organization's data may prove helpful when it comes to the environmental aspect of our project.
Loose environmental requirements allow cruise ships to dump everything overboard except untreated and solid waste. Surely the numbers on fuel consumption, and waste production will be useful in our analysis. Although this organization doesn't pinpoint any specific areas, they give us a general idea of how harmful ships are.

A Complete Online Cruise Guide

Cruise Mates categorizes all cruise ships by the company name, and then they go as far as breaking the company down to its individual ships. This site can help us determine the weights, measurements, and capacities for all cruise ships. This information will not only help us in the environmental aspect, but also give us a hint in how many tourists to expect on the various ships taking berth in Venice. Cruise Mates also provides specifications on its services, accommodations, and cruise prices. Its's the perfect site for research as well as for tourists.