The source of the info in that circulating email is Muslim apologist Charles Kurzman, Professor of Sociology at the University of North Carolina Chapel Hill.
http://sanford.duke.edu/centers/tcths/about/news_release20110202.php
The full report does not list the non-Muslim incidents and Kurzman relies on MPAC for much of his data. This seems to be one of his source documents, and it lists 26 non-Muslim incidents in 2010:
http://www.mpac.org/assets/docs/publications/MPAC-Post-911-Terrorism-Data.pdf
Only one of these was an 'environut' and one was an unknown perp.

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