ABC News Watch: Fake photo used in Science article

COMMENT: ABC recently reported on a letter signed by 250 scientists published in the journal Science.
The letter is accompanied by a photo of a lone Polar Bear on an ice berg credited to ISTOCKPHOTO.COM. The photo is a fake with the following note in the photo caption at Istockphoto: "This images is a photoshop design. Polarbear, ice floe, ocean and sky are real, they were just not together in the way they are now."
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What does the use of a faked photo say about the scientific credibility of the journal in question?