Soraya Sarhaddi Nelson

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Richard Grenell has been the U.S. ambassador to Germany for barely a month, but already politicians on both sides of the Atlantic are demanding he be recalled.

On Thursday, Hamburg became the first city in Germany to ban diesel vehicles on its streets — at least in part. But many Germans question whether the limited ban is an environmental milestone, as the city claims, or a political shell game that will ultimately create more pollution.

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