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They're predicting that in most parts of the world the new "average" will be warmer than the previous "hot" (exceeds bounds of historical variability), beginning between 2033 and 2061 (global average 2047 if we keep going the way we are). Local variations are expected. Tropical regions should get uncomfortable before elsewhere. Even a serious effort to stabilize spiraling greenhouse gas emissions will only stave off these changes until around 2069. The study was published in Nature and included 39 different models from 21 teams in 12 countries, which surprisingly all pretty much agreed.

'Uncomfortable' climates to devastate cities within a decade, study says, John Roach NBC News

Study Abstract
Ecological and societal disruptions by modern climate change are critically determined by the time frame over which climates shift beyond historical analogues. Here we present a new index of the year when the projected mean climate of a given location moves to a state continuously outside the bounds of historical variability under alternative greenhouse gas emissions scenarios. Using 1860 to 2005 as the historical period, this index has a global mean of 2069 (±18 years s.d.) for near-surface air temperature under an emissions stabilization scenario and 2047 (±14 years s.d.) under a ‘business-as-usual’ scenario. Unprecedented climates will occur earliest in the tropics and among low-income countries, highlighting the vulnerability of global biodiversity and the limited governmental capacity to respond to the impacts of climate change. Our findings shed light on the urgency of mitigating greenhouse gas emissions if climates potentially harmful to biodiversity and society are to be prevented.

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( 1 comment — Leave a comment )
ford_prefect42
Oct. 11th, 2013 01:50 am (UTC)
This is another area where I find myself skeptical. The thing is, *none* of the AOGCM models predicted the 18 year lull in warming that we are now experiencing. None of the models have, over the last 30 years, in any way accurately predicted any timeframe after their calibration period.

We engineers have a term for models that do not predict the behavior of the system being modeled. Useless.

Not to say that they're wrong, mind you, but that frankly, Gypsies have a better track record reading crystal balls than Climate Scientists do studying he models.

Now, let's play a game. Say that they're right. What is the "fix"?

An *80%* reduction in co2 emissions. Are you aware of what that would mean? Start with 4 billion deaths, as the technologies that allow people to survive New York, or Canadian, Or northern European winters become "prohibitively carbon intensive", as the long distance transportation and mechanized production of foods becomes unacceptable, as the entire infrastructure of every city on the planet becomes unusable. As.... In short, nothing that works now still does.

And all that to move the timeframe for their predicted apocalyptic warming out 7 years.

Sometimes, when faced with alternatives, the only sensible choice is to say "we'll deal with the problems you predict if we come to them". Climate change is one such case. As, to be honest, over recent decades, have been my own predictions of various dooms. All of mine were well founded, I still don't understand how they failed to cause apocalyptic results. And yet, they did. Just as the apocalyptic predictions made by every previous paper about global warming have failed to prove out.
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