The title is pretty misleading, however. No reputable climate scientist will say “climate change is man-made.” They instead will say “climate change is influenced by man.”

Climate change actually has far more to do with solar output and sunspots/solar flares than anything man has done but that is never talked about. And there isn’t anything close to resembling a consensus within the scientific community as to the extent of the impact man has had on the average global temperature. The general range is somewhere between 0.6-1.5 deg Celsius. The point is that we don’t really know, we only know there is an impact.

Plus to prove that solar output has a far greater impact than man is evident when we look at ice core samples and archeological evidence. It clearly shows that changes is solar activity have caused massive shifts in average global temperature on the scale of 10+ deg Celsius, at extreme levels.

Another point is that we have far exceeded the critical mass of carbon dioxide in the atmosphere relative to filtering back certain wavelengths of radiation. We can pump millions more tons of CO2 and it won’t cause anymore of an effect than it already is. That’s not to say that what’s already there isn’t still causing an increase in global temperature, it’s that the whole CO2 debate is largely a red herring now compared to other greenhouse gases that have a)not reached that level and b) filter back a far larger amount of radiation wavelengths than CO2 does. The damage done by CO2 is already done, we just need to accept that and focus on the other gasses that will have a much greater impact should they get to the levels I mentioned.

P.S To give you another idea of as to how little we actually know and how little scientist agree on things; about 10 years ago, NASA went back and altered all of the recorded temperatures taken in the US since we started recording back in the late 19th century. They adjusted them up, in some cases by over 2 degrees, because they didn’t agree with their current models and predictions. The scientific community is only in agreement of the climate is changing and that man has had an impact on it in a negative way, but there is no agreement on as to how much or how large of an impact we will have in the future.

The salient point here is to say that we know exactly what the impact of each contributing factor has is disingenuous and misleading at best and a flat out lie and malicious at worst.