But experts from the Tyndall Centre for climate change Research warn today that official advice used to set the budget is "naively optimistic" and will not stop dangerous climate change.

然而今天，廷德尔气候变化研究中心的专家警告说，用来设定这份预算的官方建言透着“稚嫩的乐观”，不可能制止气候变暖的危险。

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He is almost naively optimistic about Syria's future.

CNN: Cartoons that scare Syria's leader

And I remain optimistic, but not naively so, that this is going to be hard work and each side is going to have to look inward to determine what is in their long-term interests, and not just what are in their short-term tactical interests, which tends to perpetuate a conflict as opposed to solving it.

WHITEHOUSE: President Obama & Prime Minister Cameron Joint Press Availability | The White House