Even so, it is attracting a lot of attention at the astronomy meeting, including from heavyweights such as Michael Turner from the University of Chicago and the National Science Foundation.

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Barring any geopolitical events, investors' eyes will turn to corporate earnings, of which a truckload are due out this week, including such heavyweights as Microsoft Corp.

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In an effort to harmonize these efforts, sustainable tourism heavyweights including Rainforest Alliance, the United Nations Foundation, as well as travel groups such as Expedia, Federation of Tour Operators (FTO) and Hyatt Hotels have joined together to create the Global Partnership for Sustainable Tourism Criteria.

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