I said I think we can reasonably assume it's part of the equation.
I don't know why this is so challenging for folks to grasp. The earth has been warmer than it is today in its history. It's been colder. There has been more and less ice on the planet. There has been more carbon emissions than there are today. There are probably millions of things that affect climate on a daily basis and it's silly in sturg33's opinion to say that all the change we see is due to human activity.
The largest glacier in Greenland has been expanding now for three straight years, despite carbon emmissions significantly increasing over that time. What gives? Antarctic ice is expanding, despite global emmisions at all time highs. That seems odd, no?
Like I said... I'm not pretending to be some climate expert here. My opinion is such that, if it's true that human beings are the cause of the Earth's destruction, than human beings aren't going to be able to stop it. If we had the power to do so, I'd much rather the situation be solved by expanded prosperity with open markets and technology paving the way... not a monolithic government telling us we can't eat hamburgers anymore and should stop having babies. And that's before we even address the east who is the largest culprit of the CO2 problem.
We put our faith in the scientific community that has been wrong on this from the get go. The amount of time in which we've studied this is so small compared to the Earth's history that it's completely irrelevant. In the very micro (i.e. 100 years of a 4 billion year old planet), the climate is changing and we're feeling our way through on the causes and the outcomes. You'll have to forgive me for my skepticism that our incompetent government requires unrelenting power and control in order to save this... when they can't even run the post office for a profit.