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Eco-photos of the week: May 22-28

May 27, 2011, 6:29 a.m.
A silhouette of the Frankfurt Cathedral appears against the backdrop of an evening sky in Frankfurt Main, Germany on May 24.

Photo: Mark Tirl

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Silhouetted in the sunset

The silhouette of Frankfurt Cathedral is stark against the backdrop of an evening sky in Frankfurt Main, Germany, on May 24.