At the Frankfurt book fair, they now have what is known as a most stolen book index.
And apparently , Al Gore's, An Inconvenient (or is it uncomfortable?) Truth scores the top place.
"The most-stolen books are usually the most-sold later on," Claudia Hanssen of the Goldmann Verlag publishing house told Bild am Sonntag newspaper, which published a list of the 10 most stolen German-language books this year. "They're the popular ones and are most likely to end up on the best-seller lists," (from web site)
Google for terms, stolen book index for more details!
This is really funny and yet, why didn't anyone think of it earlier?