Travel and tourism is the world's largest industry, transporting more than 528 million people internationally, employing 211.7 million people, and generating US $322,000 million in receipts in 1994. And it is expanding fast. Its impact on the environment is evident. Lest environmental decline destroy the very resources - landscapes, wildlife, mountains, monuments and buildings, cultural diversity -on which it depends, the industry must act now and practice sustainability. Some organisations have already begun, but the actions of a handful are n~ sufficient. Every government, every trade organisation, and every company will have to contribute.