Why duplicate content for same page?

[nuxeo]

Hi,

My SEOMOZ crawl diagnostic warn me about duplicate content.

However, to me the content is not duplicated. For instance it would give me something like:

(URLs/Internal Links/External Links/Page Authority/Linking Root Domains)

http://www.nuxeo.com/en/about/contact?utm_source=enews&utm_medium=email&utm_campaign=enews20110516

/1/1/31/2

http://www.nuxeo.com/en/about/contact?utm_source=enews&utm_medium=email&utm_campaign=enews20110711

0/0/1/0

http://www.nuxeo.com/en/about/contact?utm_source=enews&utm_medium=email&utm_campaign=enews20110811

0/0/1/0

http://www.nuxeo.com/en/about/contact?utm_source=enews&utm_medium=email&utm_campaign=enews20110911

0/0/1/0

Why is this seen as duplicate content when it is only URL with campaign tracking codes to the same content?

Do I need to clean this?Thanks for answer

[lavellester]

Hi there,

The URLs are viewed as different due to the campaign tracking variables being appended to the end and hence it appears as though you have duplicate content.

You can resolve this by using the canonical tag.

hope this helps!