The evidence of the earth warming is huge.  The inconvenient truth is that the glaciers stopped advancing and started retreating long before any human activity could have made a difference.  You know that famous painting of Washington Crossing the Delaware through ice?  And those stories of Danes ice skating on canals in Hans Christian Anderson tales?  Those were during the Little Ice Age, which ended and glaciers started retreating long before the Industrial Revolution could have had any effect.  

Its a true "inconvenient" truth, but one hidden by liberal biased newspapers.