David Helvarg: Frases en inglés
Public comment to the US Oceans Commission, 2004 http://www.oceancommission.gov/publicomment/novcomments/helvarg_comment.pdf.
Los Angeles Times, January 26, 2005.
“Actually, any time I get to blow bubbles pretty much lights me up.”
Grist magazine, January 3, 2005, describing his love of diving