That is not the claim.
It's that - as the largely Christian founders of the scientific method understood - us humans are often wrong. Prejudiced, distracted, full of weird assumptions - the scientific
method was born out of the understanding that even the human intellect is
fallen. Christians helped develop the
methods of investigation that try to double-check our understanding of the world with empirical tests.
Or let me put it another way. Science has often been wrong - but using the scientific method is all we've got. Some things are pretty much 'known' - like the boiling point of water or how much CO2 warms the atmosphere. But even in climate science there are still a few smaller debates.
Does CO2 warm air? Yes. Easily confirmed in any decent lab.
Does this look like a real problem? Yes - accelerated water cycles means more drying and drought here, and dumping deluges over there. Moving ecosystems, destroyed ecosystems, extinctions, crop cuts - we are getting glimpses of all these things now and they're accelerating.
BUT - what is the
exact Climate Sensitivity of the earth's system?
Climate sensitivity
This tells us how sensitive our climate is to rising greenhouse gas emissions from human activities — specifically, how much warmer the planet will get if we double our carbon dioxide emissions.
Vital Signs of the Planet: Global Climate Change and Global Warming. Current news and data streams about global warming and climate change from NASA.
climate.nasa.gov
But the great James Hansen - the grandfather of modern climate science - says we're all a bit too conservative - and that the earth is far more sensitive and there will be FAR more warming from the CO2 we have emitted. Now - I'm not a scientist let alone a climate scientist studying one of the most complex interacting systems we've ever tried to analyse. But I take comfort in that Michael Mann has had to respond to his hero James Hansen and try to correct him somewhat. It looks like Hansen - who I respect enormously as an incredible scientist and passionate advocate for sustainability - may have fallen in with some younger scientists that were swayed by some argument from the paleoclimate record that doesn't quite pass muster.
Because if the earth's climate is THAT sensitive - then we may as well join "Toby" from "The Office". (I love that they chose this actor to play a climate doomer in "The Newsroom" - as it's like Aaron Sorkin was keeping the joke running. No one liked "Toby" either - and here he is as a climate doomer bringing everyone's Friday night waaaaaay down!)
For the record - this is NOT what I understand the IPCC to be saying - and "Climate Doomers" are now actually being sponsored by Big oil. Why? Because if Big Oil has failed to stop people taking climate change seriously - they've found that getting them to take it TOO seriously also achieves their goals.
Becoming a Doomer robs people of the will to try - to do any activism. For without any hope for the future you may as well "Eat drink and be merry, for tomorrow we die." Live it up - guilt free - because there is no point to any pesky activism. But now it gets sinister. Climate Doomers are SUCH an effective deterrent to climate activism that Big Oil are sponsoring Climate Doomers! So to any Climate Doomers here - be careful who you believe online - because Big Oil might just be buying your opinion for you! Atmospheric Physicist and youtuber Simon Clark explains.