For all the talk about how Dubya is ruining the environment, the reality is somewhat different.  When it comes to auto emissions, the US has the tightest auto emissions laws in the world.  For instance, starting this year, US autos are only allowed to put out 1/4th as much NO2 as their European counterparts.  But across the board, from cars to industry emissions, the US air quality laws are far stricter than other industrialized nations.  When it comes to clean air, the US - Republican or Democrat, is taken very seriously.