Do you believe in it?
My opinion is that yes the temperature is changing but we aren't the ones causing it. Throughout history the earth has undergone temperature cycles and there has been a correlation between co2 and average temperature. However which leads the other is not certain.
There have also been a multitude of 'natural' sources recently, such as volcanoes that have dumped much more co2 into the atmosphere than man, and relatively the contribution to co2 emissions we make is negligible.
What are your opinions?