It's the words: stupid.
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The problem with the report (or at least the summary) is that it doesn't say anything definite. Yes, it claims there is a Very high risk of vulnerability to various things, and risk of loss of some others. But we hear that sort of stuff every day, so all these new risks, dangers and all the rest just merges into the clamour for our attention.
An attention which is almost fully taken up with trying to get past the next set of traffic lights. Trying to fart silently in the meeting and hoping no-one will notice. Wondering where the next credit-card payment will come from or why that if statement with 4 conditions always comes out as TRUE.
If these guys (or any of the other climate change bods) wants our attention - or even more: for someone, somewhere to actually DO something, they need much more than wishy-washy risks and dangers. They need numbers, dates, times and places. Who will die - specifically - their names please, when and what will the photos look like on the news reports. Who will have to pay. Which wars will break out and how much civil unrest will there be - and in which towns - and did they for for our party.
Without specifics, there is little for our leaders to lead us away from. People don't respond well to intangible, distant and unquantifed threats that may (or may not) happen at some indeterminate time in the future. More than that: they really don't feel the need to change their lives or shell out more cash to fix problems that they can't actually see - and for which the solutions cannot be agreed (do we need more of this, less of that -- or what?) amongst the scare-mongerers.
To get people to address the problems of climate change, there needs to be much more certainty, Reports must show clarity and be specific in their claims. Who, where, when, how-much. Without actual, actionable targets they will be producing a sixth, seventh, eighth report. All of which will say the same sorts of things, with ever more shrill language. All of which will get a little media attention and people saying "we really should start thinking about what we can do" - and then doing nothing since their attentions will be focused on the immediate problems of that day, as they always have been and always will be.