Since this comes up a lot, a quick run though of the testable, falsifiable, science that supports a human cause of recent trends in global mean temperature.pic.twitter.com/VfjAuBgQQt
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1991: Eruption of Pinatubo will lead to ~2-3 yrs of cooling 2001: Increases in GHGs will be detectable in space-based spectra 2004: Increases in GHGs will lead to continued warming at ~0.18ºC/decade.
We test the predictions:
Stratospheric cooling?
Detectable warming?
OHC increase?
Pinatubo-related cooling?
Space-based changed in IR absorption?
post-2004 continued warming?
With this validated physics, we can estimate contributions to the longer term trends.https://www.bloomberg.com/graphics/2015-whats-warming-the-world/ …
This too is of course falsifiable. If one could find a model system that matches all of the previously successful predictions in hindcasts, and gives a different attribution, we could test that. [Note this does not (yet) exist, but let's keep an open mind].
We can also look at the testable, falsifiable, theories that were tested, and failed.
Solar forcing? Fails the strat cooling test.
Ocean circulation change? Fails the OHC increase test
Orbital forcing? Fails on multiple levels 
If you have a theory that you don't think has been falsified, or you think you can falsify the mainstream conclusions, that's great! We can test that too! (But lots of people have tried this already so expect there to be an answer already).
PS. Actually, it's even a bit harder. Not only would you need to find a theory that does as well as the current theory, but you'd also need to show why the current theory isn't operative.
Gavin, what's the 1981 paper you are thinking of? Schneider, I think, but I can't figure out which one!
Hansen et al 1981 in science
"1967: increasing CO2 will cause the stratosphere to cool" Shouldn't the prediction be: Increased CO2 will correlate with cooling of the stratosphere?
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