Last week's announcement that United Airlines will buy up to $10 billion in new aircraft was widely viewed as a sign of a turnaround for the airline industry. But it could also be viewed as an environmental play, according to a Wall Street Journal blog, which notes that fuel efficiency and carbon emissions go hand-in-hand. "United's planned investment might stretch its balance sheet now, but getting new, more fuel-efficient aircraft could pay dividends for years to come. And unlike fuel-hedging strategies, which can backfire, fuel-efficient jets can't," says Keith Johnson in the blog Environmental Capital.

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