the US report was from a conveniently chosen period between 2001-2003
when there was an economic downturn - so emissions were down slightly but certainly not because of any policy of the Bush WHite House
(who so called Clear skies act actually allowed more pollution than before)
also the way the emissions are calculated is misleading. The 20% increase in Canadian oil & gas exports to the US since 1990 is added to Canadas emissions - not the US's, go figure.