We have Sandy, a Yorkshire Terrier, and a German Shepherd named Sam.

我们有一只叫桑迪的约克郡犬，还有一只德国牧羊犬，叫萨姆。

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While it's impossible to say that any particular event was "caused by global warming, " says Shepherd, climate change loads the deck, making extreme events such as last year's Superstorm Sandy more likely.

CNN: CO2 levels hit new peak at key observatory