"starcrafttom" "Not to down play the need to be aware of the dangers of C02 poisoning but the report you linked states that only 500 deaths per year. Thats not a lot. deaths from obesity 280,000 per year."
Research Support, U.S. Gov't, Public Health Service
"bicycle deaths 630"
National Highway Traffic Safety Administration: Traffic Safety Facts - 2009 Data (released in 2010, and still the most recent)
"heres a list of causes of death. Highest number on the list? self harm 29,350.."
Source: National Safety Council "estimates based on data from National Center for Health Statistics and U.S. Census Bureau
Good points, all from government supported studies.