Usually we're focused on our personal power consumption -- wondering why our gas bill went up or took a dip. But what if we added up everybody's power consumption? How much would it be?

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Community based tourism refers to situations in which local people—usually those that are poor or economically marginalized in very rural parts of the world—open up their homes and communities to visitors seeking sustainably achieved cultural, educational or recreational travel experiences.

Community-based tourism generates lucrative revenues for poor or native communities in developing countries while enabling travelers usually accustomed to chain hotels and beachfront resorts to learn about traditional cultures.

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Decades of chemical pollution have damaged the ozone layer of the upper atmosphere that shields Earth from the harmful effects of the sun's ultraviolet rays, each summer eating a hole over the South Pole that expands to nearly the size of Antarctica.

But since 1996, when an international treaty banned the culprit chemical refrigerants and propellants (known as CFCs, or chlorofluorocarbons), the size of the seasonal tear has been shrinking—and scientists predict it may stop forming by the end of this century.