The Christian Science Monitor answers their article title's question about how to find and take a green cruise. Happily it seems that most of the large cruise lines respect and care for the ocean and marine life, claims a conservation advocate, which is something that large oceanside hotels aren't so great about doing. But later on in the article it is recommended to "avoid major cruise lines" and take smaller and shorter boat excursions. However each individual passenger needs to be aware of his/her own impact when at ports of call. And naturally travel to less heavily-touristed areas help local economies and lessen the already heavy impact of too many travelers.
Read the full story: Is it possible to take an ecofriendly cruise?