How hot is the shower?
As one increases the temperature of the water, the answer to this question becomes less and less subjective and more and more objective. Eventually, it becomes conclusively too hot, where cellular damage can be measured.
I mention this because on re-entering the blogosphere lately, I have found the comment threads are still awash with the “CAGW” acronym. Prove to me, they ask, that any warming that is due to human activity could be catastrophic.
Of course it’s a sign of weakness from the committed sceptic and I flag it to my reader in the hope they spot it for what it is and save themselves the effort in confronting the fellow seriously. They are not interested in a genuine reasoned argument. It’s a sideshow; a trump card played by someone needing attention rather than seeking clarity on a subject they indeed are open-minded to.*
I don’t care who mentioned the word “catastrophic” in what publication. Yes, I have been focusing on values of late, but here we have a great example (and warning) of poor communication that just will not die. It has played into the hands of the committed sceptic and has been something I’ve run into continually for the past three years as a blogger.
In truth, you cannot say with any great certainty that any amount of warming will be catastrophic until it becomes too hot. Venus is too hot, but we’re not likely to hit such temperatures until the sun is on the way out.
Would the committed sceptic find the previous ice age to be catastrophic if it reoccurred within a century from now? That was around 5oC cooler that today.
It is entirely up to ones judgement whether or not such a significant shift could be termed “catastrophic”. A half intelligent committed sceptic is aware of this.
Hence you have a stalemate position and a smug smile returned for your attempt at reasoned debate on the subject. It’s likely most of us would find a world 6oC warmer to be “catastrophic” to how and where we live and grow food and to biodiversity richness, but you cannot expect that to be acknowledged by others.
I’ve seen enough projections from the Australian Bureau of Meteorology and research currently being completed by researchers within working teams I have been associated with (currently unpublished) to be concerned by as little as 2oC additional warmth to South Australia, however projections as much as 4oC warming in Greenland might look good. How hot is too hot?
The projections for this coming century are within the realms of a subjective answer to such questions. You cannot hope to question the validity of “catastrophic anthropogenic global warming” because the answer remains subjective. They know that. That’s why they hand it to you so easily.
The first suggestion to such a situation may be to ignore it, but this just doesn’t cut it. So what can we do to counter such a subjective question?
In my opinion, make it clear that the committed sceptic has posed a subjective question – they’ve asked you how hot is too hot. It depends on where you are and what you think would be too much stress to local systems. Ask them to dry a line in the sand; tell you what they would think is objectively too hot – what would they see as being “catastrophic”.
Either they’ll offer you something objective (ie. ice caps melted or frequency of extreme weather events) from which you can start to refer to the science literature on the subject or expose themselves to be ‘pissing in the wind’ for attention. That is to say if they refer to a “warmist” statement on what is “catastrophic” or of balmy summer holidays to the UK, they remain in the subjective. Tell them so and move on.
From my experience, such individuals that refer to “CAGW” are typically bombastic and avoid answering questions directly. They will probably cut-and-paste quotes from their favourite “sceptical” website and dart from one accusation to another.
Don’t try to keep up with them, for they are well trained to Gish Gallop and will leave you for dust. Continually press on this initial point and for their personal statement on what is too hot. You’ll probably find that, like a puppy, if you won’t chase them, they’ll grow bored of the game and either attempt a dialogue or (more likely) move on to greener pastures for attention, saving you time and effort.
*I’m aware that, at this point, it is likely many of the committed sceptic have shut off and are darting towards the comment stream to complain noisily with terms like “warmist”, conspiracy theories and self-righteous claims of awareness in the face of my apparent arrogance or ignorance. I’d hope you can take the time to read the rest of the post and hopefully provide more thoughtful reflection.