Many of the people I work with have studied climate science for decades (others are mediocre engineers who can't build a toothpick bridge properly but fancy themselves experts) and after having this debate in the breakroom and staff meetings countless times, all I can say is: climate change, whether warming, cooling, etc. has TOO many variables to be certain it's man made. There's not a single paper "proving it" that can't be debunked or contradicted. 150 years of measuring temps, gasses like CO2, etc. on a planet that's billions of years old is simply not enough data. (Still not enough data if you think it's only 10,000 years old or whatever) There are solar flares, the Van Allen belt, our elliptical orbit, axial tilt, the distance from the moon is not static which changes the tides which affects the polar ice caps, and so on.... there's things that we may not even be aware of affecting the climate! ALL OF THESE either singly or in combinations can affect climate change over both short and long terms so to narrow it down to "it's man made and that's that" is not very scienc-y. Sadly, science like everything else has been dragged into two-sided political realms and people are more concerned with being "right" than they are about being accurate.
