Pete Seeger, Mark Ruffalo Protest Hydrofracking (VIDEO)

07/22/2010 10:03 am ET | Updated May 25, 2011

Pete Seeger and actor Mark Ruffalo traveled to Albany Tuesday to push for a moratorium on hydrofracking.

The two celebrities were flanked by environmental supporters who oppose the controversial natural gas extraction method.

Seeger even wrote a tune for the event.

See video below.