…Keep out of the kitchen

It appears that Ian Wishart is back on the climate beat, with a couple of posts in the last week attacking Hot Topic. One goes so far as to accuse me of incompetence and dishonesty, which is a bit rich coming from someone who was threatening to sue me for libel a few months ago… Anyway, his latest offering attempts to chastise me for stating in a comment that global temperatures were not falling. That gives me a welcome opportunity to post on the subject and introduce a nifty little gadget programmed by a Hot Topic reader. Here’s Wishart:

Virtually all the major datasets are now acknowledging atmospheric warming has slowed to a crawl or stopped over the past ten years, and even some leading climate alarmists scientists are publicly suggesting we’ve entered a climate shift and may not see warming return for a further decade or more. The data clearly shows temperature anomalies trending down despite CO2 emissions rising:

He appends a graph of UAH monthly temperature anomalies from 2002 to some point earlier this year, with a descending trend line. Lo and behold, “cooling”!

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Fomenting unhappy mischief…

I usually stay out of the fray at NZ’s political blogs, but sometimes it’s impossible to resist a brief plunge into bracing waters. Yesterday, David Farrar at Kiwiblog posted approvingly about the impending launch of a movie called Not Evil, Just Wrong, apparently intended as a counter to Gore’s Inconvenient Truth. Here’s Farrar:

The film compares the consequences of the ban on DDT, with the cost of trying to ban carbon emissions. They talk about how Al Gore would have you believe the sea level will rise by 20 feet in the near future, when in fact the IPCC say this would be over millennia.

Here’s Ed Darrell:

The film is both evil and wrong. Errors just in the trailer:

1: Claims that Al Gore said sea levels will rise catastrophically, “in the very near future.” Not in his movie, not in his writings or speeches. Not true. That’s a simple misstatement of what Gore said, and Gore had the science right.

[plus eight more]

It’s sad to see Farrar giving credence to the DDT ban myth — something that’s been shown to be the product of a US tobacco-funded attack on the WHO in the late ’90s. It’s even sadder to see his mischaracterisation of the climate problem:

And again I agree the long-term trend is for warming, but the hysteria over how it is urgent to have cut emissions by 40% by 2020 or the planet is doomed, is just that. In fact by 2020 the planet may still be in a cooling phase.

The “cooling phase” thing is based on something a German modeller didn’t say at a conference a few weeks ago. Climate Crock Of The Week provides the full context (you can hear what Latif actually said), and Joe Romm interviews the man to get the truth. The whole “cooling for 20 years” thing is a beat-up by cranks. And 40%? That’s an IPCC AR4 recommendation…

But Farrar’s misunderstanding runs deeper:

As we get better technology, and gradually transition to energy sources that produce fewer emissions, our carbon emissions will reduce. But 2020 is not some date of no return.

Sadly, we passed the point of no return a long time ago. We are now committed to considerable warming — our current emissions trajectory is pointing us at 4ºC by 2060 — and unless we take rapid steps to reduce global emissions, staying under the 2ºC “guardrail” is already looking unlikely. The longer we leave cutting emissions, the steeper the cuts we will eventually have to make (and the more expensive they will have to be) if we are stay within reasonable temperature bounds. Far from being a counsel of moderation, Farrar is allowing his misconceptions to mislead us into greater danger.

Farrar is of course a National party stalwart, credited by some with being the premiere spinmeister for the present government. If this post were just the ill-conceived ramblings of a right-wing blogger, designed as a dog whistle summons to the crazies who are his commentariat, then it would be worth ignoring. But Farrar’s site is NZ’s top ranking blog, and his thinking looks suspiciously like a reflection of what’s going on in the National caucus. It’s the fallacy of the false middle, based on placing yourself in the middle of a debate you deem to be polarised, but where only one side has the facts right. And that’s not the nutters in Kiwiblog’s comments calling for those who want action on climate change to be “hung, drawn and quartered”.

Deep time, deep water

The last time CO2 hit a sustained level of 400 ppm 15-20 million years ago global average temperatures were 3 – 6ºC warmer than now, and sea level was 25 to 40 m higher, according to research released last week. That’s bad news, because the target for current international negotiations to find a successor to Kyoto is 450 ppm. The finding also provides support for James Hansen’s view that 350 ppm is the maximum “safe level” for CO2 if we want to inhabit a planet with ice at both poles.

Meanwhile, analysis of the Andrill core has discovered a “remarkably warm” period in Antarctica that occurred abruptly 15.7 million years ago, when the McMurdo Sound region could have had January air temperatures of 10ºC and sea temps up to 11.5ºC, according to a new paper in Geology.

Continue reading “Deep time, deep water”

A beginner’s guide to the importance of Arctic sea ice

[youtube]_m-M37vc-m0[/youtube]

In this beginner’s guide Tom Wagner, NASA’s cryosphere programme manager, outlines why studying Arctic sea ice is important, illustrating his talk with some great graphics. Meanwhile, the NSIDC has announced the final figures for September’s sea ice minimum:

The average ice extent over the month of September, a reference comparison for climate studies, was 5.36 million square kilometers (2.07 million square miles). This was 1.06 million square kilometers (409,000 square miles) greater than the record low for the month in 2007, and 690,000 square kilometers (266,000 square miles) greater than the second-lowest extent in 2008. However, ice extent was still 1.68 million square kilometers (649,000 square miles) below the 1979 to 2000 September average.

NSIDC scientist Walt Meier thinks there may be some hope of “stabilising” the ice after recent heavy losses:

We’ve preserved a fair amount of first-year ice and second-year ice after this summer compared to the past couple of years. If this ice remains in the Arctic through the winter, it will thicken, which gives some hope of stabilizing the ice cover over the next few years. However, the ice is still much younger and thinner than it was in the 1980s, leaving it vulnerable to melt during the summer.

But will there be a longer term recovery back towards the sort of ice cover seen before 2000? The NSIDC team doesn’t think so.

NSIDC lead scientist Ted Scambos said, “A lot of people are going to look at that graph of ice extent and think that we’ve turned the corner on climate change. But the underlying conditions are still very worrisome.”

After a couple of cool summers, one wonders what impact another warm year might do to the ice. As ever, I shall be watching next year with great interest…

Nine ways to stuff up a planet

How is humanity stuffing up the planet — shall we count the ways? There are nine, according to new work by a multidisciplinary team lead by Johan Rockström of the Stockholm Resilience Centre — full paper and supporting materials (with videos of authors explaining key points) here. The diagram above (from Nature’s coverage) shows the nine “planetary boundaries” within which humanity would be wise to operate. The good news is that on five of the measures we’re still in the safety zone. The bad news is that we’re well over safe limits for climate change, biodiversity loss, and interference with the nitrogen cycle, and we don’t know the limits for the final two factors. Here’s the full table:

Continue reading “Nine ways to stuff up a planet”