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It is true that there are other factors - such as volcanic activity, variations in the earth's orbit and axis, the solar cycle - yet a number of scientific studies indicate that most global warming in recent decades is due to the great concentration of greenhouse gases - carbon dioxide, methane, nitrogen oxides and others - released mainly as a result of human activity.

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    "Time spent with cats is never wasted." is widely attributed to?
    A Kelly Clarkson
    B Robin Williams
    C Ellen Degeneres
    D Sigmund Freud