But however An Inconvenient Truth finally brings home the argument that there’s no time to lose. Throughout the film it’s getting obvious that Gore really seems to care for the problem, that he has been tirelessly working on communicating real clearly that we have to change to our daily habits and that we entered (quoting Churchill) “an era of consequences”.  
After all Al Gore was awarded the Nobel Peace Prize 2007 together with the Intergovernmental Panel on Climate Change "for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change" (quoted from nobelprize.org)
The movie however leaves you kind of concerned but with a higher level of knowledge and the undeniable certainty that we’re running out of time.

Watch the first statement of Al Gore after winning the Nobel Prize: