Chad Clark's Open Journal : 2008-01-15

1) Auto exhaust produced air pollution mutates sperm in mice.

The Canada.com story reads:

  A Health Canada-led study of mice has confirmed that pollution wafting
  off highways and out of steel mills triggers sperm mutations that can be
  passed to the next generation.
  
  ...
  
  The study is a follow-up to a 2004 study led by McMaster University
  biologists that showed male mice that breathed Hamilton's air passed on
  twice as many mutations to their offspring as mice that inhaled air
  stripped of the fine particles in air pollution, known as particulates,
  produced by vehicles and fossil-fuel burning industrial plants.
  
  ...
  
  Their study "revealed a 1.6 fold (or 60 per cent) increase in sperm
  mutation frequency" in mice breathing air near the mills and highway for
  10 weeks, compared to mice breathing filtered air.
  
  They report that many of the mutations in the sperm DNA persisted even
  after the mice were no longer exposed to the pollution