I think you may have tinted glasses. I'm a lay person and I certainly didn't get the impression that the sky was falling after reading Mann's essay. Regarding the two other links - Cook isn't a climate scientist and Hanson didn't say anything about tornadoes except that he had been in one and that heat is the fuel for tornados but that we don't yet know if frequency will increase and we didn't have enough data to tell if there has been a trend. On the other hand, look at these links:
David Archer on methane increase: "Is this bad news for global warming? Not really, because the one real hard fact that we know about atmospheric methane is that it’s concentration isn’t rising very quickly. Methane is a short-lived gas in the atmosphere, so to make it rise, the emission flux has to continually increase " - http://www.realclimate.org/ind...
What about that Arctic methane bomb? "Shakhova et al (2013) did not find or claim to have found a 50 Gt C reservoir of methane ready to erupt in a few years. That claim, which is the basis of the Whiteman et al (2013) $60 trillion Arctic methane bomb paper, remains as unsubstantiated as ever. - See more at: http://www.realclimate.org/ind...
The fact that the ice core records do not seem full of methane spikes due to high-latitude sources makes it seem like the real world is not as sensitive as we were able to set the model up to be. - See more at: http://www.realclimate.org/ind...
Here's William Connoly betting against an arctic death spiral (and trying to engage in a bet against arctic ice recovery): http://scienceblogs.com/stoat/...
Here is the head of the NASA climate team explaining why he and others publicly mocked a colleague during a presentation where the colleague suggested that we may be experiencing an arctic death spiral. His excuse seems to include the fact that he was mocking both sides (read further for examples): The negative engagement stemmed both from the “green” end (which we would characterize as “things are worse than they seem”) and from the “blue” end (“things are not as bad as they seem”). We were actively deflecting negative criticisms from both blue and green “wings” throughout both meetings. - https://drive.google.com/file/...