Great video: 62 years of global warming in 13 seconds

This video has been out there for a bit, but bears watching again (hey, it's only 13 seconds). Here's my new take-away. Notice how the warming pattern has fluctuated wildly over the years (weather, natural variations). But, what really leaped out at me this time is how obvious the long term trend is.

Global Warming - The Big Picture

Many thanks to David Roberts at Grist for this one. See my post (11/27/12) about the World Bank report - hitting 4 degrees Celcius would seem to be likely even if all carbon reducing commitments are met! (And, given the record, how likely is that?)

Permafrost melting – do we care yet?

A recent paper in the journal Science by Anton Baks et. al. has studied the effects of past climate warming on the planet’s permafrost and concluded that a 1.5˚C  global rise in  temperatures over the long term baseline will create a significant weakening of the permafrost. We’re already halfway there (0.8˚C) and will hit that target by mid-century.

Permafrost cracking pattern in the high Arctic.
Photo credit: Brocken Inaglory via Wikimedia Commons

When the permafrost melts, the buried plant matter is exposed to sunlight (UV rays in particular), the the process of bacteria converting that stored carbon to CO2 and methane accelerates, releasing perhaps 40% of these greenhouse gases into the atmosphere. That can’t be good, no matter what.

Just how bad it is, however, is still scientifically uncertain, as is the rate of warming up there.

On “just how bad it is,” there are mitigating factors. One, the bacteria convert a lot of the biomass to CO2 which is much less threatening than methane. No one knows what that ration will be, but the scary articles usually assume its all methane. Not so. Two, the process takes time – decades will pass between the arrival of the warming and the actual increase in atmospheric heat trapped as a result. By that time, the total greenhouse gas releases from all the usual suspects may drown out the permafrost contribution.

On the rate of change front, however, there is plenty of reason to worry. Studies by NASA in 2012 indicate that the permafrost is melting much faster than the global average – in fact, they’ve already risen by 2.2-3.9 degrees C (or 4-7 degrees F) over the last century. Another study shows that the actual recorded rises in methane and CO2 over the world’s permafrost is much, much greater than predictions by the IPCC and others. One thing we’re certainly learned from three decades or so of climate predictions is: the consensus is always low, and often very low, compared to what actually shows up.

We need more study on the permafrost front, certainly. My takeaway is this: it’s one more time bomb ready to go off, and when you add up all the similarly under-studied and under-reported time bombs (melting of the glaciers comes to mind), we need to be very, very worried. Even if the odds are low, it’s the only planet we have and we can’t afford to guess wrong.

It keeps getting scarrier...

A new report from the World Bank – not exactly a radical left-wing organization, eh? – has this to day:

• Even if all emissions-reductions commitments are kept, we’ll hit 4 degrees Celsius (that’s over 9 degrees Fahrenheit) of warming by the end of the century. If they aren’t, we’ll hit it by 2060.
• The impact of a 4-degrees-warmer world will be: “unprecedented heat waves, severe drought, and major floods in many regions, with serious impacts on human systems, ecosystems, and associated services. “
• The observed changes in climate have been escalating, not stabilizing and certainly not slowing down.

What will the 4 degree world look like?

•  Extreme heat – with consequences (heat-related deaths, forest fires, harvest losses) that “could be expected to vastly exceed the consequences experienced to date, and potentially exceed the adaptive capacities of many societies and natural systems.”
•  Rising sea levels – expect a rise of 0.5 – 1.0 meters (that’s over 9 feet) at a minimum with several meters more in the centuries to follow (there’s a lot of momentum in climate change – we can’t just shut it off today and expect things to return to normal tomorrow).  You’ve seen the maps – this affects a huge percentage of the area where we live.
• Everything we rely on for our daily lives will be affected: clean water, crops, food animals, even just the ability to travel around safely. Life as we know it, basically, will be drastically altered, mostly for the worse.

Any hope?

The report states what we’ve known for the last two or three decades, that we have the “technical and economic” means to avoid the worst impacts of global warming. It even holds out hope we can keep the warming below 2 degrees (I don’t share that hope – the 2 degree number was a politically chosen one, and at the time it was chosen, the full effects of feedback loops was not incorporated into the scientific models).

Trouble is, the technology and money won’t help if we don’t have the political will to use them. So far, it’s been nearly completely lacking. Let’s hope the Climate Change talks going on in Doha this week get us started on the path.

You can get the report here: http://climatechange.worldbank.org/

It's not the heat, its....oh, wait

Climate scientists have been telling us for a couple of decades now that, even though global warming is the cause, we'd be seeing its effects in other areas besides straight temperature rises. For the record, not only have their predictions come true by and large, but they have been too conservative...but that's another column. For today, it's worth noting during these unprecedented heat waves that the temperature effects are finally showing up as well. There's a very good article on the subject at Climate Communication (view it here). Here's a sample, looking at a very simple and easy to understand data point, the ratio of record highs to record lows over the last 60 years. If normal, random variations in climate were occurring, you'd expect that ratio to be close to 1.0. In other words, in any given period, you'd expect just as many record highs and record lows to occur. Random changes, 50-50 chances. Back in the 1950s, when the effects of human greenhouse gas generation was just kicking in to high gear, the ratio was 52/48 in favor of record highs. Pretty close to random. In the last three years, the ratio went from 56/44 to 73/27 (in 2011) and is 90/10 so far this year.

Beef: the new delicacy

Doing the math:
Cost: 60% of world's agricultural land
Benefit: 5% of protein and 2% of calories

Normally, when a food item is really expensive, we eat it rarely and call it a delicacy. Trouble is, the expense of tying up that much agricultural land (significant contributions to world-wide hunger and global warming) isn't borne by the consumers of beef, so we in the "developed" world think it's much cheaper than it really is, and eat it all the time.

It's not the heat...

When most people think of Global Warming, they think "getting hotter." But that's not what we're going to notice first. Scientists have said for awhile now that the first thing we'll notice is extreme weather (fueled by the heat).

Thing is - it takes a lot of degrees of heat for us to notice it personally, but only a little extra heat for storm systems to take notice.

Weather followers have been noticing for years now that the hurricanes seem stronger and more frequent, the droughts longer and more intense, the forest fire season longer and more intense, 100-year floods occurring several times a decade, etc. etc. But there's always been the caveat: these events are local events, and you can't pin local weather events on a global phenomenon like global warming.

No longer.

Two (count 'em) new studies published in yesterday's issue of Nature - one of the planet's most prestigious science journals - does exactly that. In one study, the heavy flooding in the UK was studied and researchers showed that global warming was the only explanation the fit the data. In the second, the increase in rain intensity in the Northern Hemisphere was again shown to be explicable only in terms of global warming.

Global warming isn't a future problem. It's here.

Here's a link the the Nature article: [click]