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Quantifying our Faustian bargain with fossil fuels 

Quantifying our Faustian bargain with fossil fuels 

Our Faustian bargain: the byproduct of burning dirty
fossil fuels are short-lived atmospheric aerosols
which provide temporary cooling

The climate system will heat well past 1.5 degrees Celsius (°C) and perhaps up to 2°C without any further fossil fuel emissions. That’s the conclusion to be drawn from new research which should also help demystify the rhetoric from the 2015 Paris climate talks of keeping warming to below 1.5°C .

It’s not that 1.5°C isn’t dangerous: in fact, at just 1–1.1°C of warming to date, climate change is already dangerous. A safe climate would be well below the present level of warming, unless you think it is OK to destroy the Arctic ecosystem, tip West West Antarctic glaciers into a self-accelerating melt, and lose the world’s coral reefs, just for starters.

The new research quantifies the effect of losing the very temporary planetary cooling provided by atmospheric aerosols.
Aerosols (including black-carbon soot, organic carbon, sulphates and nitrates and dust) are very short-lived particles in the atmosphere that have a cooling impact that lasts around a week. Most of these aerosols are anthropogenic, that is produced by human activity, and most of the anthropogenic aerosols are a byproduct of the extraction and burning of fossil fuels. Perhaps best known are the polluting sulphates and nitrates from coal-fired power stations, that combine with water molecules in the atmosphere to produce what is popularly known as “acid rain”.

The problem is our “Faustian bargain”: these aerosols are keeping the planet cooler than it would otherwise be, but are coming from burning fossil fuels that pour carbon dioxide (CO2) into the atmosphere, heating the planet for centuries to come. The absolutely essential moves to eliminate fossil fuel emissions will also cut the cooling aerosol impact; the net effect will push the planet towards very dangerous warming conditions.

…click on the above link to read the rest of the article…

More Evidence We’ve Reached a “Peak Water” Tipping Point in California

More Evidence We’ve Reached a “Peak Water” Tipping Point in California

March in Yosemite, four years running (source; click to enlarge)

It may be a see-saw course, but it’s riding an uphill train.

A bit ago I wrote, regarding climate and tipping points:

The concept of “tipping point” — a change beyond which there’s no turning back — comes up a lot in climate discussions. An obvious tipping point involves polar ice. If the earth keeps warming — both in the atmosphere and in the ocean — at some point a full and permanent melt of Arctic and Antarctic ice is inevitable. Permanent ice first started forming in the Antarctic about 35 million years ago, thanks to global cooling which crossed a tipping point for ice formation. That’s not very long ago. During the 200 million years before that, the earth was too warm for permanent ice to form, at least as far as we know.

We’re now going the other direction, rewarming the earth, and permanent ice is increasingly disappearing, as you’d expect. At some point, permanent ice will be gone. At some point before that, its loss will be inevitable. Like the passengers in the car above, its end may not have come — yet — but there’s no turning back….

I think the American Southwest is beyond a tipping point for available fresh water. I’ve written several times — for example, here — that California and the Southwest have passed “peak water,” that the most water available to the region is what’s available now. We can mitigate the severity of decline in supply (i.e., arrest the decline at a less-bad place by arresting its cause), and we can adapt to whatever consequences can’t be mitigated.

But we can no longer go back to plentiful fresh water from the Colorado River watershed. That day is gone, and in fact, I suspect most in the region know it, even though it’s not yet reflected in real estate prices.

– See more at: http://downwithtyranny.blogspot.co.uk/2015/10/more-evidence-weve-reached-peak-water.html#sthash.Ou6zIx2b.dpuf

 

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